Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) - USD ($) $ in Millions		Dec. 31, 2016	Dec. 31, 2015
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		$ 104,926	$ 105,333
Asset Fair Value		2,005	2,313
Liability Fair Value		3,194	2,994
Interest rate contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[1]	75,354
Foreign currency contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[2]	1,191
Equity market contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		28,315
Credit contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		66
Cash flow hedges | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		4,729	3,847
Asset Fair Value		221	276
Liability Fair Value		132	48
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]	70,290	71,898
Asset Fair Value	[3]	985	1,088
Liability Fair Value	[3]	701	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]	14	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]	28,315	27,882
Asset Fair Value	[3]	541	680
Liability Fair Value	[3]	616	269
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]	3,552	2,937
Asset Fair Value	[3]	68	192
Liability Fair Value	[3]	122	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]	1,177	910
Asset Fair Value	[3]	153	84
Liability Fair Value	[3]	10	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]	1,512	1,529
Asset Fair Value	[3]	258	269
Liability Fair Value	[3]	182	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]	66	103
Liability Fair Value	[4]		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]	371	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]	53	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]	$ 1,139	$ 1,100

[1] As of December 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 December 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.