Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Outstanding derivative instruments with off-balance-sheet risks
Asset Carrying or Fair Value	$ 2,490		$ 3,547
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	43,777	[1]	36,539	[1]
Asset Carrying or Fair Value	403	[1]	1,042	[1]
Liability Carrying or Fair Value	565	[1]	475	[1]
Derivative investments [Member] | Foreign Exchange Contract [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	15	[1]	48	[1]
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	19,347	[1]	19,857	[1]
Asset Carrying or Fair Value	1,368	[1]	1,734	[1]
Liability Carrying or Fair Value	60	[1]	170	[1]
Derivative investments [Member] | Equity Collar [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts			9	[1]
Asset Carrying or Fair Value			1	[1]
Derivative investments [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	4,369		3,634
Asset Carrying or Fair Value	575		501
Liability Carrying or Fair Value	177		250
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	3,804	[1]	3,214	[1]
Asset Carrying or Fair Value	535	[1]	462	[1]
Liability Carrying or Fair Value	160	[1]	224	[1]
Derivative investments [Member] | Cash Flow Hedges [Member] | Foreign Exchange Contract [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	565	[1]	420	[1]
Asset Carrying or Fair Value	40	[1]	39	[1]
Liability Carrying or Fair Value	17	[1]	26	[1]
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	875	[1]	875	[1]
Asset Carrying or Fair Value	144	[1]	269	[1]
Liability Carrying or Fair Value	5	[1]
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	148	[2]	148	[2]
Liability Carrying or Fair Value	8	[2]	11	[2]
Future contract benefits [Member] | Indexed Annuity and Universal Life Contracts [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Liability Carrying or Fair Value	862	[3]	732	[3]
Future contract benefits [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
Asset Carrying or Fair Value	292	[3]
Liability Carrying or Fair Value			909	[3]
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 Carrying or Fair Value	$ 131	[4]	$ 215	[4]

[1] Reported in derivative investments on our Consolidated Balance Sheets.

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

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

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