Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) - USD ($) $ in Millions		Dec. 31, 2018	Dec. 31, 2017
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		$ 135,355	$ 107,840
Asset Fair Value		2,625	2,308
Liability Fair Value		1,986	3,376
Interest rate contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[1]	102,709
Foreign currency contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[2]	2,373
Equity market contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		30,273
GLB Direct 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	[3]	123	903
GLB Ceded 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	[3],[4]	72	51
Liability Fair Value	[3],[4]	196	954
Embedded derivatives - Reinsurance related [Member] | Derivative Instruments Not Designated and Not Qualifying as Hedging Instruments [Member]
Outstanding derivative instruments with off-balance-sheet risks
Asset Fair Value	[5]	188
Liability Fair Value	[5]		51
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	[3],[6]	902	11
Liability Fair Value	[3],[6]	1,305	1,418
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		3,854	3,348
Asset Fair Value		200	124
Liability Fair Value		48	95
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	[7]	100,628	72,937
Asset Fair Value	[7]	464	657
Liability Fair Value	[7]	138	127
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	[7]	47	22
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	[7]	30,273	30,918
Asset Fair Value	[7]	676	562
Liability Fair Value	[7]	162	557
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	[7]		52
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	[7]	1,528	1,544
Asset Fair Value	[7]	33	45
Liability Fair Value	[7]	9	16
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	[7]	2,326	1,804
Asset Fair Value	[7]	167	79
Liability Fair Value	[7]	39	79
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	[7]	553	563
Liability Fair Value	[7]	$ 137	$ 174

[1] As of December 31, 2018, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was March 2027.

[2] As of December 31, 2018, 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 other assets 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.

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