Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) - USD ($) $ in Millions		Mar. 31, 2017	Dec. 31, 2016
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		$ 112,626
Interest rate contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[1]	82,269
Foreign currency contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[2]	1,238
Equity market contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		29,063
Credit contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		56
Total Derivative Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		112,626	$ 104,926
Asset Fair Value		1,863	2,005
Liability Fair Value		2,105	3,194
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]	77,202	70,290
Asset Fair Value	[3]	695	985
Liability Fair Value	[3]	160	701
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]	25	14
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]	29,063	28,315
Asset Fair Value	[3]	526	541
Liability Fair Value	[3]	393	616
Derivative investments [Member] | Credit contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	56	66
Derivative investments [Member] | Cash flow hedges | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		4,787	4,729
Asset Fair Value		170	221
Liability Fair Value		90	132
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]	3,574	3,552
Asset Fair Value	[3]	39	68
Liability Fair Value	[3]	80	122
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]	1,213	1,177
Asset Fair Value	[3]	131	153
Liability Fair Value	[3]	10	10
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]	1,493	1,512
Asset Fair Value	[3]	246	258
Liability Fair Value	[3]	174	182
Other assets [Member] | Embedded derivatives - GLB [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Asset Fair Value	[4]	226
Other liabilities [Member] | Embedded derivatives - GLB [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments
Outstanding derivative instruments with off-balance-sheet risks
Liability Fair Value	[5]		371
Reinsurance related embedded derivatives [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	[6]	50	53
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	[7]	$ 1,238	$ 1,139

[1] As of March 31, 2017, 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, 2017, 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 assets on our Consolidated Balance Sheets.Reported in other liabilities on our Consolidated Balance Sheets.

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

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

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