Deferred Policy Acquisition Costs and Present Value of Future Profits Level 4 (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended						3 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2013
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Balance, end of period	$ 521		$ 689		$ 3,072		$ 689
Deferred costs	14		16		329
Amortization — DAC	(110)		(124)		(280)
Amortization — Unlock charge, pre-tax	(96)	[1]	(104)	[1]	(44)	[1]
Depreciation and Amortization, Discontinued Operations	0		0		35
Disposition of DAC asset	(206)		(228)		(324)
Adjustments to unrealized gains and losses on securities available-for-sale and other	(24)		(58)		346
Balance, beginning of period	689		3,072		3,448
Retirement Plans [Member]
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Amortization — DAC							(352)
Adjustments to unrealized gains and losses on securities available-for-sale and other	(148)
Individual Life [Member]
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Amortization — DAC							(2,374)
Adjustments to unrealized gains and losses on securities available-for-sale and other	(349)
Retirement Plans and Individual Life Businesses [Member]
Movement Analysis of Deferred Policy Acquisition Costs and Present Value of Future Profits [Roll Forward]
Disposition of DAC asset	$ 0		$ (2,229)		$ 0

[1] Includes accelerated amortization of $352 and $2,374 recognized upon the sale of the Retirement Plans and Individual Life businesses, respectively, in the first quarter of 2013. For further information, see Note 2 - Business Dispositions of Notes to Consolidated Financial Statements.