Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	$ 83,976		$ 71,594
Asset Fair Value	2,587		3,102
Liability Fair Value	2,301		2,322
Interest Rate Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	58,830	[1]
Foreign Currency Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	710	[2]
Equity Market Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	24,310
Credit Risk Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	126
Derivative investments [Member] | Interest Rate Contract [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	54,401	[3]	45,620	[3]
Asset Fair Value	989	[3]	215	[3]
Liability Fair Value	342	[3]	744	[3]
Derivative investments [Member] | Foreign Currency Contract [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	68	[3]	102	[3]
Derivative investments [Member] | Equity Market Contract [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	24,310	[3]	19,917	[3]
Asset Fair Value	886	[3]	957	[3]
Liability Fair Value	243	[3]	193	[3]
Derivative investments [Member] | Cash flow hedges | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	4,196		4,954
Asset Fair Value	453		594
Liability Fair Value	219		194
Derivative investments [Member] | Cash flow hedges | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	3,554	[3]	4,339	[3]
Asset Fair Value	408	[3]	562	[3]
Liability Fair Value	198	[3]	148	[3]
Derivative investments [Member] | Cash flow hedges | Foreign Currency Contract [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	642	[3]	615	[3]
Asset Fair Value	45	[3]	32	[3]
Liability Fair Value	21	[3]	46	[3]
Derivative investments [Member] | Fair value hedges | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	875	[3]	875	[3]
Asset Fair Value	259	[3]	92	[3]
Liability Fair Value			33	[3]
Other liabilities [Member] | Credit Risk Contract [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	126	[4]	126	[4]
Liability Fair Value	3	[4]	2	[4]
Other liabilities [Member] | GLB Embedded Derivative Reserves [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	174	[4]
Future contract benefits [Member] | GLB Embedded Derivative Reserves [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Asset Fair Value			1,244	[5]
Future contract benefits [Member] | Indexed annuity and IUL contracts embedded derivatives [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	1,170	[5]	1,048	[5]
Reinsurance related [Member] | Reinsurance Related [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	$ 150	[6]	$ 108	[6]

[1] As of December 31, 2014, 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 December 31, 2014, 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 future contract benefits on our Consolidated Balance Sheets.

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