Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Notional Value
Non-Qualifying Hedge Relationships	$ 439,280	[1],[2]	$ 419,224	[1],[2],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	13,932	[2]	7,775	[2],[3]
Total Derivatives	1,593		533
Fair Value Liability
Derivative Fair Value Of Derivative Liability	6,817	[2]	9,418	[2],[3]
Total Derivatives	(158)		(2,156)
Designated as Hedging Instrument [Member]
Notional Value
Qualifying Hedge Relationships	12,929	[1]	12,592	[1],[3]
Fair Value Asset
Total Derivatives	705		260	[3]
Fair Value Liability
Total Derivatives	366		838	[3]
Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	426,351	[1],[4]	406,632	[1],[3],[4]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	13,227	[4]	7,515	[3],[4]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	6,451	[4]	8,580	[3],[4]
Interest Rate Contract [Member]
Fair Value Asset
Total Derivatives	10,595		6,140
Fair Value Liability
Total Derivatives	(4,954)		(7,607)
Interest Rate Contract [Member] | Interest Rate Swap Member | Designated as Hedging Instrument [Member]
Notional Value
Qualifying Hedge Relationships	1,714	[1]	2,556	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	21		26	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	191		253	[3]
Interest Rate Contract [Member] | Interest Rate Swap Member | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	182,937	[1]	171,337	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	9,904		5,727	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	4,578		7,051	[3]
Interest Rate Contract [Member] | Futures [Member] | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	32,008	[1]	34,424	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	5		10	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	3		5	[3]
Interest Rate Contract [Member] | Interest Rate Swaption Member | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	27,561	[1]	25,308	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	663		370	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	180		297	[3]
Interest Rate Contract [Member] | Forward Contracts Member | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	877	[1]	1,452	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	2		0	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	1		6	[3]
Foreign Exchange Contract [Member]
Fair Value Asset
Total Derivatives	865		593
Fair Value Liability
Total Derivatives	(1,025)		(425)
Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Notional Value
Qualifying Hedge Relationships	443	[1]	534	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	5		1	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	14		32	[3]
Foreign Exchange Contract [Member] | Foreign Exchange Forward [Member] | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	21,197	[1]	13,122	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	854		587	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	1,011		393	[3]
Foreign Exchange Contract [Member] | Foreign Exchange Option Member | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	203	[1]	118	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	6		5	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	0		0	[3]
Credit Risk Contract [Member]
Fair Value Asset
Total Derivatives	7		3
Fair Value Liability
Total Derivatives	(30)		(49)
Credit Risk Contract [Member] | Credit Default Swap Member | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	2,622	[1]	1,890	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	7		3	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	30		49	[3]
Cross Currency Interest Rate Contract [Member]
Fair Value Asset
Total Derivatives	1,885		647
Fair Value Liability
Total Derivatives	(307)		(857)
Cross Currency Interest Rate Contract [Member] | Currency Swap Member | Designated as Hedging Instrument [Member]
Notional Value
Qualifying Hedge Relationships	10,772	[1]	9,502	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	679		233	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	161		553	[3]
Cross Currency Interest Rate Contract [Member] | Currency Swap Member | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	11,083	[1]	7,787	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	1,207		414	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	145		304	[3]
Equity Contract [Member]
Fair Value Asset
Total Derivatives	572		390
Fair Value Liability
Total Derivatives	(503)		(475)
Equity Contract [Member] | Equity Futures [Member] | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	331	[1]	262	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	3		1	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	0		1	[3]
Equity Contract [Member] | Equity Options [Member] | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	57,590	[1]	61,231	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	504		388	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	41		12	[3]
Equity Contract [Member] | Total Return Swap Member | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	15,217	[1]	11,554	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	65		1	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	462		462	[3]
Synthetic Gics [Member] | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	74,707	[1]	78,110	[1],[3],[5]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	6		8	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	0		0	[3]
Synthetic Gics [Member] | Nondesignated [Member] | Scenario Previously Reported [Member]
Notional Value
Non-Qualifying Hedge Relationships			60,758
Commodity Contract [Member]
Fair Value Asset
Total Derivatives	1		1
Fair Value Liability
Total Derivatives	0		0
Commodity Contract [Member] | Futures [Member] | Nondesignated [Member]
Notional Value
Non-Qualifying Hedge Relationships	18	[1]	37	[1],[3]
Fair Value Asset
Derivative Fair Value Of Derivative Asset	1		1	[3]
Fair Value Liability
Derivative Fair Value Of Derivative Liability	$ 0		$ 0	[3]

[1] Notional amounts are presented on a gross basis and include derivatives used to offset existing positions.

[2] Excludes embedded derivatives which contain multiple underlyings. The fair value of these embedded derivatives was a net liability of $8,162 million as of December 31, 2014 and a net liability of $430 million as of December 31, 2013, primarily included in “Future policy benefits.”

[3] Prior period has been revised to include the gross notional amount and fair value of derivative contracts used in a broker-dealer capacity.

[4] Based on notional amounts, most of the Company’s derivatives do not qualify for hedge accounting as follows: i) derivatives that economically hedge embedded derivatives do not qualify for hedge accounting because changes in the fair value of the embedded derivatives are already recorded in net income, ii) derivatives that are utilized as macro hedges of the Company’s exposure to various risks typically do not qualify for hedge accounting because they do not meet the criteria required under portfolio hedge accounting rules, and iii) synthetic GICs, which are product standalone derivatives that do not qualify as hedging instruments under hedge accounting rules.

[5] The gross notional amount as of December 31, 2013 has been revised from $60,758 million to $78,110 million to correct the previously reported amount. This amount does not impact the Consolidated Financial Statements.