Derivative Instruments (Outstanding Derivative Instruments With Off-Balance-Sheet Risks) (Details) - USD ($) $ in Millions		Dec. 31, 2019	Dec. 31, 2018
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		$ 163,315	$ 137,497
Asset Fair Value		4,384	2,529
Liability Fair Value		4,306	1,793
Interest Rate Contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[1]	116,569
Foreign currency contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts	[2]	3,136
Equity market contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		43,555
Credit contracts [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		55
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]	60	72
Liability Fair Value	[3]	9
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member]
Outstanding derivative instruments with off-balance-sheet risks
Notional Amounts		5,261	5,067
Asset Fair Value		299	237
Liability Fair Value		296	48
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	[4]	112,921	100,628
Asset Fair Value	[4]	1,082	464
Liability Fair Value	[4]	219	138
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	[4]	262	47
Asset Fair Value	[4]	1
Liability Fair Value	[4]	3
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	[4]	43,555	30,487
Asset Fair Value	[4]	1,442	676
Liability Fair Value	[4]	664	162
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	[4]	55
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	[4]	2,387	2,741
Asset Fair Value	[4]	108	70
Liability Fair Value	[4]	245	9
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	[4]	2,874	2,326
Asset Fair Value	[4]	191	167
Liability Fair Value	[4]	51	39
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	[4]	1,261	1,268
Asset Fair Value	[4]	123	55
Liability Fair Value	[4]	203	137
Other Assets [Member] | 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]	450	123
Reinsurance Related Embedded Derivatives [Member] | 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	[5]	327	3
Future Contract Benefits [Member] | Indexed Annuity And IUL Contracts [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]	927	902
Liability Fair Value	[3],[6]	$ 2,585	$ 1,305

[1] As of December 31, 2019, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was April 20, 2067.

[2] As of December 31, 2019, the latest maturity date for which we were hedging our exposure to the variability in future cash flows for these instruments was February 26, 2050.

[3] Reported in other assets on our Consolidated Balance Sheets.

[4] Reported in derivative investments and 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.