| Consolidated Statements of Cash Flows [Abstract] | |
| Net cash provided by operating activities | 2.73B |
| Cash flows from investing activities | |
| Sales, maturities and repayments of fixed maturity securities | |
| Sales, maturities and repayments of equity securities | |
| Sales, maturities and repayments of mortgage loans | 2.51B |
| Sales, maturities and repayments of real estate and real estate joint ventures | |
| Sales, maturities and repayments of other limited partnership interests | |
| Purchases of fixed maturity securities | -34.7B |
| Purchases of equity securities | -389M |
| Purchases of mortgage loans | -1.76B |
| Purchases of real estate and real estate joint ventures | |
| Purchases of other limited partnership interests | |
| Cash received in connection with freestanding derivatives | 330M |
| Cash paid in connection with freestanding derivatives | -2.43B |
| Sale of interest in joint venture | |
| Net change in policy loans | -52M |
| Net change in short-term investments | 3.3B |
| Net change in other invested assets | -226M |
| Other, net | 40M |
| Net cash used in investing activities | -9.72B |
| Cash flows from financing activities | |
| Policyholder account balances: Deposits | 21.37B |
| Policyholder account balances: Withdrawals | -20.03B |
| Net change in payables for collateral under securities loaned and other transactions | 528M |
| Net change in bank deposits | 8M |
| Net change in short-term debt | 0 |
| Long-term debt issued | |
| Long-term debt repaid | -240M |
| Cash received in connection with collateral financing arrangements | |
| Debt issuance costs | |
| Common stock issued, net of issuance costs | |
| Stock options exercised | |
| Redemption of convertible preferred stock | |
| Preferred stock redemption premium | |
| Dividends on preferred stock | -30M |
| Other, net | -75M |
| Net cash provided by financing activities | 1.32B |
| Effect of change in foreign currency exchange rates on cash and cash equivalents balances | -93M |
| Change in cash and cash equivalents | |
| Cash and cash equivalents, beginning of period | |
| Cash and cash equivalents, end of period | |
| Cash and cash equivalents, subsidiaries held-for-sale, beginning of period | |
| Cash and cash equivalents, subsidiaries held-for-sale, end of period | |
| Cash and cash equivalents, from continuing operations, beginning of period | |
| Cash and cash equivalents, from continuing operations, end of period | |
| Supplemental disclosures of cash flow information: | |
| Net cash paid during the period for Interest | 264M |
| Net cash paid (received) during the period for Income tax | |
| Non-cash transactions during the period: | |
| Real estate and real estate joint ventures acquired in satisfaction of debt | |