Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	$ 69,603		$ 61,110
Asset Fair Value	2,828		3,547
Liability Fair Value	2,053		2,762
Interest Rate Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	49,347	[1]
Foreign Currency Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	704	[2]
Equity Market Contract [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	19,426
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 [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	44,081	[3]	36,539	[3]
Asset Fair Value	340	[3]	1,042	[3]
Liability Fair Value	613	[3]	475	[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	89	[3]	48	[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	19,426	[3]	19,857	[3]
Asset Fair Value	1,052	[3]	1,734	[3]
Liability Fair Value	184	[3]	170	[3]
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	[3]
Asset Fair Value			1	[3]
Derivative investments [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	5,006		3,634
Asset Fair Value	605		501
Liability Fair Value	191		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	4,391	[3]	3,214	[3]
Asset Fair Value	573	[3]	462	[3]
Liability Fair Value	150	[3]	224	[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	615	[3]	420	[3]
Asset Fair Value	32	[3]	39	[3]
Liability Fair Value	41	[3]	26	[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	875	[3]	875	[3]
Asset Fair Value	120	[3]	269	[3]
Liability Fair Value	15	[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]	148	[4]
Liability Fair Value	5	[4]	11	[4]
Future contract benefits [Member] | Indexed Annuity and Universal Life Contracts Embedded Derivatives [Member] | Derivative Instruments Not Designated And Not Qualifying As Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	924	[5]	732	[5]
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 Fair Value	711	[5]
Liability Fair Value			909	[5]
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	$ 121	[6]	$ 215	[6]

[1] As of September 30, 2013, 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 September 30, 2013, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was April 2028.

[3] Reported in derivative investments 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.