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	$ 7,337	$ 6,200
Items Included in Net Income	1,986	(621)
Gains (Losses) in OCI and Other	(101)	119
Issuances, Sales, Maturities, Settlements, Calls, Net	49	417
Transfers Into or Out of Level 3, Net	(34)	(166)
Ending Fair Value	9,237	5,949
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	6,978	5,652
Items Included in Net Income		(1)
Gains (Losses) in OCI and Other	(367)	69
Issuances, Sales, Maturities, Settlements, Calls, Net	102	208
Transfers Into or Out of Level 3, Net	42	(17)
Ending Fair Value	6,755	5,911
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	5
Ending Fair Value	5
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	90	109
Gains (Losses) in OCI and Other	(3)	1
Ending Fair Value	87	110
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	11	7
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
Ending Fair Value	1	2
ABS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	268	134
Gains (Losses) in OCI and Other	(4)
Issuances, Sales, Maturities, Settlements, Calls, Net	21	149
Transfers Into or Out of Level 3, Net	(89)	(105)
Ending Fair Value	196	178
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	78	75
Gains (Losses) in OCI and Other	(6)	3
Ending Fair Value	72	78
Trading Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	666	67
Items Included in Net Income	(32)
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
Ending Fair Value	30	25
Derivative Investments [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	868	533
Items Included in Net Income	997	(382)
Gains (Losses) in OCI and Other	279	46
Issuances, Sales, Maturities, Settlements, Calls, Net	(117)	70
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
Ending Fair Value		439
GLB Direct Embedded Derivatives [Member] | Other Liabilities [Member]
Level 3 Unobservable Input Reconciliation
Items Included in Net Income	(4,596)
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	4,529	(22)
Ending Fair Value	4,589	50
GLB Ceded Embedded Derivatives [Member] | Other Liabilities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	(510)	(196)
Items Included in Net Income	510	(293)
Ending Fair Value		(489)
Indexed Annuity And IUL Contracts [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	927	902
Items Included in Net Income	(115)	77
Issuances, Sales, Maturities, Settlements, Calls, Net	(13)	(107)
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)
Issuances, Sales, Maturities, Settlements, Calls, Net	62	(109)
Ending Fair Value	$ (1,380)	$ (1,730)