Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) - USD ($) $ in Millions		Dec. 31, 2015	Dec. 31, 2014
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		$ 105,333	$ 83,976
Asset Fair Value		2,313	2,587
Liability Fair Value		2,994	2,301
Interest rate contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[1]	76,364
Foreign currency contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[2]	984
Equity market contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		27,882
Credit contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		103
Cash flow hedges | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		3,847	4,196
Asset Fair Value		276	453
Liability Fair Value		48	219
Derivative investments [Member] | Interest rate contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	71,898	54,401
Asset Fair Value	[3]	1,088	989
Liability Fair Value	[3]	330	342
Derivative investments [Member] | Foreign currency contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	74	68
Derivative investments [Member] | Equity market contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	27,882	24,310
Asset Fair Value	[3]	680	886
Liability Fair Value	[3]	269	243
Derivative investments [Member] | Cash flow hedges | Interest rate contracts [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	2,937	3,554
Asset Fair Value	[3]	192	408
Liability Fair Value	[3]	46	198
Derivative investments [Member] | Cash flow hedges | Foreign currency contracts [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	910	642
Asset Fair Value	[3]	84	45
Liability Fair Value	[3]	2	21
Derivative investments [Member] | Fair value hedges | Interest rate contracts [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	1,529	875
Asset Fair Value	[3]	269	259
Liability Fair Value	[3]	198
Other Liabilities [Member] | Credit contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[4]	103	126
Liability Fair Value	[4]	9	3
Other Liabilities [Member] | Embedded derivatives - GLB reserves [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	[4]	953	174
Reinsurance related [Member] | Embedded derivatives - Reinsurance related [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	[5]	87	150
Future contract benefits [Member] | Embedded derivatives - Indexed annuity and IUL contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	[6]	$ 1,100	$ 1,170

[1] As of December 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 December 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 2045.

[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.