Closed Block (Liabilities and Assets) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2012
Closed Block Liabilities
Future policy benefits	$ 41,683	$ 42,076
Other policy-related balances	282	298
Policyholder dividends payable	493	456
Policyholder dividend obligation	2,825	1,771	3,828
Current income tax payable	23	18
Other liabilities	629	582
Total closed block liabilities	45,935	45,201
Assets Designated to the Closed Block
Fixed maturity securities available-for-sale, at estimated fair value	28,976	28,374
Equity securities available-for-sale, at estimated fair value	90	86
Mortgage loans	6,091	6,155
Policy loans	4,651	4,669
Real estate and real estate joint ventures	586	492
Other invested assets	882	814
Total investments	41,276	40,590
Cash and cash equivalents	349	238
Accrued investment income	501	477
Premiums, reinsurance and other receivables	91	98
Deferred income tax assets	301	293
Total assets designated to the closed block	42,518	41,696
Excess of closed block liabilities over assets designated to the closed block	3,417	3,505
Amounts included in accumulated other comprehensive income (loss) (“AOCI”)
Unrealized investment gains (losses), net of income tax	2,109	1,502
Unrealized gains (losses) on derivatives, net of income tax	12	(3)
Allocated to policyholder dividend obligation, net of income tax	(1,836)	(1,151)
Total amounts included in AOCI	285	348
Maximum future earnings to be recognized from closed block assets and liabilities	$ 3,702	$ 3,853