Fair Value of Financial Instruments (Fair Value Measured On A Recurring Basis Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	$ 5,141	$ 4,014
Items Included in Net Income	(2,376)	(337)
Gains (Losses) in OCI and Other	(119)	120
Issuances, Sales, Maturities, Settlements, Calls, Net	113	409
Transfers Into or Out of Level 3, Net	(35)	(166)
Ending Fair Value	2,724	4,040
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	4,281	3,269
Items Included in Net Income		(1)
Gains (Losses) in OCI and Other	(385)	70
Issuances, Sales, Maturities, Settlements, Calls, Net	165	200
Transfers Into or Out of Level 3, Net	42	(17)
Ending Fair Value	4,103	3,521
ABS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	268	134
Items Included in Net Income
Gains (Losses) in OCI and Other	(4)
Issuances, Sales, Maturities, Settlements, Calls, Net	22	149
Transfers Into or Out of Level 3, Net	(90)	(105)
Ending Fair Value	196	178
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	5
Items Included in Net Income
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	5
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	90	109
Items Included in Net Income
Gains (Losses) in OCI and Other	(3)	1
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	87	110
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	11	7
Items Included in Net Income
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net	(10)	(7)
Ending Fair Value	1
CMBS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	1	2
Items Included in Net Income
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	1	2
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	78	75
Items Included in Net Income
Gains (Losses) in OCI and Other	(6)	3
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	72	78
Trading Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	666	67
Items Included in Net Income	(32)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	(6)	206
Transfers Into or Out of Level 3, Net	23	(37)
Ending Fair Value	651	236
Equity Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	30	25
Items Included in Net Income
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	30	25
Derivative Investments [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	868	534
Items Included in Net Income	997	(383)
Gains (Losses) in OCI and Other	279	46
Issuances, Sales, Maturities, Settlements, Calls, Net	(117)	70
Transfers Into or Out of Level 3, Net
Ending Fair Value	2,027	267
GLB Direct Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	450	123
Items Included in Net Income	(450)	316
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value		439
GLB Direct Embedded Derivatives [Member] | Other Liabilities [Member]
Level 3 Unobservable Input Reconciliation
Items Included in Net Income	(4,596)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	(4,596)
GLB Ceded Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	60	72
Items Included in Net Income	668	(22)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	728	50
GLB Ceded Embedded Derivatives [Member] | Other Liabilities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	(9)
Items Included in Net Income	9	(8)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value		(8)
Indexed Annuity Ceded Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	927	902
Items Included in Net Income	(115)	77
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	(13)	(107)
Transfers Into or Out of Level 3, Net
Ending Fair Value	799	872
Indexed Annuity And IUL Contracts [Member] | Future Contract Benefits [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	(2,585)	(1,305)
Items Included in Net Income	1,143	(316)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	62	(109)
Transfers Into or Out of Level 3, Net
Ending Fair Value	$ (1,380)	$ (1,730)