Fair Value of Financial Instruments (Fair Value Measured On A Recurring Basis Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	$ 2,126	$ 4,258	$ 5,141	$ 4,014
Items Included in Net Income	2,541	(552)	(382)	(1,296)
Gains (Losses) in OCI and Other	200	73	282	290
Issuances, Sales, Maturities, Settlements, Calls, Net	(644)	393	(847)	1,603
Transfers Into or Out of Level 3, Net	(327)	(235)	(298)	(674)
Ending Fair Value	3,896	3,937	3,896	3,937
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	4,344	3,648	4,281	3,269
Items Included in Net Income	(7)	3	(7)	3
Gains (Losses) in OCI and Other	197	(49)	17	45
Issuances, Sales, Maturities, Settlements, Calls, Net	30	256	181	627
Transfers Into or Out of Level 3, Net	(12)	51	80	(35)
Ending Fair Value	4,552	3,909	4,552	3,909
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	5		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	(5)		(5)
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	86	113	90	109
Items Included in Net Income
Gains (Losses) in OCI and Other		2	(4)	6
Issuances, Sales, Maturities, Settlements, Calls, Net	(20)		(20)
Transfers Into or Out of Level 3, Net
Ending Fair Value	66	115	66	115
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	2		11	7
Items Included in Net Income
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net		10		10
Transfers Into or Out of Level 3, Net			(9)	(7)
Ending Fair Value	2	10	2	10
CMBS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	1	2	1	2
Items Included in Net Income
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net		7		7
Transfers Into or Out of Level 3, Net
Ending Fair Value	1	9	1	9
ABS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	424	320	268	134
Items Included in Net Income
Gains (Losses) in OCI and Other	2	1	3	2
Issuances, Sales, Maturities, Settlements, Calls, Net	60	69	318	477
Transfers Into or Out of Level 3, Net	(73)	(173)	(176)	(396)
Ending Fair Value	413	217	413	217
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	90	78	78	75
Items Included in Net Income
Gains (Losses) in OCI and Other	1		(1)	3
Issuances, Sales, Maturities, Settlements, Calls, Net	14		10
Transfers Into or Out of Level 3, Net			18
Ending Fair Value	105	78	105	78
Trading Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	673	523	666	67
Items Included in Net Income	3	10	(1)	12
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	(120)	146	(140)	723
Transfers Into or Out of Level 3, Net	(21)	(113)	10	(236)
Ending Fair Value	535	566	535	566
Equity Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	29	68	30	25
Items Included in Net Income	2	(11)	1	(11)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	20	(3)	20	40
Transfers Into or Out of Level 3, Net
Ending Fair Value	51	54	51	54
Derivative Investments [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	595	466	868	534
Items Included in Net Income	958	184	555	(128)
Gains (Losses) in OCI and Other		119	267	234
Issuances, Sales, Maturities, Settlements, Calls, Net	(189)	22	(326)	151
Transfers Into or Out of Level 3, Net	(216)		(216)
Ending Fair Value	1,148	791	1,148	791
GLB Direct Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value			450	123
Items Included in Net Income			(450)	(123)
GLB Direct Embedded Derivatives [Member] | Other Liabilities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	(3,086)	(1)
Items Included in Net Income	1,980	(845)	(1,106)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	(1,106)	(846)	(1,106)	(846)
GLB Ceded Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	571	111	60	72
Items Included in Net Income	(290)	130	221	169
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	281	241	281	241
GLB Ceded Embedded Derivatives [Member] | Other Liabilities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value			(9)
Items Included in Net Income			9	(846)
Ending Fair Value		(846)		(846)
Indexed Annuity Ceded Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	664	903	927	902
Items Included in Net Income	295	7	484	128
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	(423)	(19)	(875)	(139)
Transfers Into or Out of Level 3, Net
Ending Fair Value	536	891	536	891
Indexed Annuity And IUL Contracts [Member] | Future Contract Benefits [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	(2,272)	(1,973)	(2,585)	(1,305)
Items Included in Net Income	(400)	(30)	(88)	(500)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	(16)	(95)	(15)	(293)
Transfers Into or Out of Level 3, Net
Ending Fair Value	$ (2,688)	$ (2,098)	$ (2,688)	$ (2,098)