Closed Block (Liabilities and Assets) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Closed Block Liabilities
Future policy benefits	$ 42,228	$ 42,586
Other policy-related balances	284	298
Policyholder dividends payable	489	466
Policyholder dividend obligation	2,273	3,828
Current income tax payable	21	0
Other liabilities	635	602
Total closed block liabilities	45,930	47,780
Assets Designated to the Closed Block
Fixed maturity securities available-for-sale, at estimated fair value	28,725	30,546
Equity securities available-for-sale, at estimated fair value	94	41
Mortgage loans	6,243	6,192
Policy loans	4,670	4,670
Real estate and real estate joint ventures	463	459
Other invested assets	963	953
Total investments	41,158	42,861
Cash and cash equivalents	302	381
Accrued investment income	492	481
Premiums, reinsurance and other receivables	87	107
Current income tax recoverable	0	2
Deferred income tax assets	324	319
Total assets designated to the closed block	42,363	44,151
Excess of closed block liabilities over assets designated to the closed block	3,567	3,629
Amounts included in AOCI:
Unrealized investment gains (losses), net of income tax	1,825	2,891
Unrealized gains (losses) on derivatives, net of income tax	15	9
Allocated to policyholder dividend obligation, net of income tax	(1,477)	(2,488)
Total amounts included in AOCI	363	412
Maximum future earnings to be recognized from closed block assets and liabilities	$ 3,930	$ 4,041