Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) - USD ($) $ in Millions		Mar. 31, 2016	Dec. 31, 2015
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		$ 115,556
Interest rate contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[1]	84,393
Foreign currency contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[2]	1,016
Equity market contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		30,044
Credit contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		103
Total Derivative Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		115,556	$ 105,333
Asset Fair Value		3,475	2,313
Liability Fair Value		4,733	2,994
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]	80,003	71,898
Asset Fair Value	[3]	2,179	1,088
Liability Fair Value	[3]	504	330
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	74
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]	30,044	27,882
Asset Fair Value	[3]	626	680
Liability Fair Value	[3]	627	269
Derivative investments [Member] | Cash flow hedges | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		3,815	3,847
Asset Fair Value		305	276
Liability Fair Value		224	48
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]	2,873	2,937
Asset Fair Value	[3]	215	192
Liability Fair Value	[3]	210	46
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]	942	910
Asset Fair Value	[3]	90	84
Liability Fair Value	[3]	14	2
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]	1,517	1,529
Asset Fair Value	[3]	365	269
Liability Fair Value	[3]	251	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	103
Liability Fair Value	[4]	12	9
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]	1,916	953
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]	111	87
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	[6]	$ 1,088	$ 1,100

[1] As of March 31, 2016, 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, 2016, 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.