Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Dec. 31, 2014
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	$ 92,773
Interest Rate Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	67,633	[1]
Foreign Currency Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	650	[2]
Equity Market Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	24,364
Credit Risk Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	126
Total Derivative Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	92,773		83,976
Asset Fair Value	3,054		2,587
Liability Fair Value	2,951		2,301
Derivative investments [Member] | Interest Rate Contract [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	62,982	[3]	54,401	[3]
Asset Fair Value	1,456	[3]	989	[3]
Liability Fair Value	396	[3]	342	[3]
Derivative investments [Member] | Foreign Currency Contract [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	8	[3]	68	[3]
Derivative investments [Member] | Equity Market Contract [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	24,364	[3]	24,310	[3]
Asset Fair Value	835	[3]	886	[3]
Liability Fair Value	334	[3]	243	[3]
Derivative investments [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	3,753		4,196
Asset Fair Value	448		453
Liability Fair Value	91		219
Derivative investments [Member] | Cash Flow Hedges [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	3,111	[3]	3,554	[3]
Asset Fair Value	377	[3]	408	[3]
Liability Fair Value	84	[3]	198	[3]
Derivative investments [Member] | Cash Flow Hedges [Member] | Foreign Currency Contract [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	642	[3]	642	[3]
Asset Fair Value	71	[3]	45	[3]
Liability Fair Value	7	[3]	21	[3]
Derivative investments [Member] | Fair Value Hedges [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	1,540	[3]	875	[3]
Asset Fair Value	315	[3]	259	[3]
Liability Fair Value	230	[3]
Other Liabilities [Member] | Credit Risk Contract [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	126	[4]	126	[4]
Liability Fair Value	3	[4]	3	[4]
Other Liabilities [Member] | GLB Embedded Derivative Reserves [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	552	[4]	174	[4]
Reinsurance Related Embedded Derivatives [Member] | Reinsurance Related [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	165	[5]	150	[5]
Future contract benefits [Member] | Indexed Annuity and IUL Contracts [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	$ 1,180	[6]	$ 1,170	[6]

[1] As of March 31, 2015, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was April 2067.

[2] As of March 31, 2015, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was December 2029.

[3] Reported in derivative investments and other liabilities on our Consolidated Balance Sheets.

[4] Reported in other liabilities on our Consolidated Balance Sheets.

[5] Reported in reinsurance related embedded derivatives on our Consolidated Balance Sheets.

[6] Reported in future contract benefits on our Consolidated Balance Sheets.