Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		$ 108,855
Interest rate contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[1]	77,292
Foreign currency contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[2]	1,604
Equity market contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		29,959
Credit contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts
Total Derivative Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		108,855	$ 104,926
Asset Fair Value		2,309	2,005
Liability Fair Value		2,324	3,194
Derivative investments [Member] | Interest rate contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	72,319	70,290
Asset Fair Value	[3]	752	985
Liability Fair Value	[3]	142	701
Derivative investments [Member] | Foreign currency contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
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 [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	29,959	28,315
Asset Fair Value	[3]	534	541
Liability Fair Value	[3]	471	616
Derivative investments [Member] | Credit contracts [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]		66
Derivative investments [Member] | Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		5,103	4,729
Asset Fair Value		136	221
Liability Fair Value		143	132
Derivative investments [Member] | Cash Flow Hedges [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	3,524	3,552
Asset Fair Value	[3]	37	68
Liability Fair Value	[3]	97	122
Derivative investments [Member] | Cash Flow Hedges [Member] | Foreign currency contracts [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	1,579	1,177
Asset Fair Value	[3]	99	153
Liability Fair Value	[3]	46	10
Derivative investments [Member] | Fair Value Hedges [Member] | Interest rate contracts [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[3]	1,449	1,512
Asset Fair Value	[3]	261	258
Liability Fair Value	[3]	180	182
Other assets [Member] | Embedded derivatives - GLB [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Asset Fair Value	[4],[5]	570
Liability Fair Value	[4],[5]		371
Other liabilities [Member] | Embedded derivatives - GLB [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Asset Fair Value	[4],[5]	53
Liability Fair Value	[4],[5]	7
Reinsurance related embedded derivatives [Member] | Embedded derivatives - 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	[6]	63	53
Future contract benefits [Member] | Indexed annuity and embedded derivatives [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Asset Fair Value	[4],[7]	3
Liability Fair Value	[4],[7]	$ 1,318	$ 1,139

[1] As of September 30, 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 September 30, 2017, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was September 2049.

[3] Reported in derivative investments and other liabilities on our Consolidated Balance Sheets.

[4] Reported in other assets 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.