Fair Value of Financial Instruments (Fair Value Measured On A Recurring Basis Reconciliation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	$ 2,724	$ 4,040	$ 5,141	$ 4,014
Items Included in Net Income	(549)	(407)	(2,925)	(744)
Gains (Losses) in OCI and Other	201	97	82	217
Issuances, Sales, Maturities, Settlements, Calls, Net	(314)	801	(201)	1,210
Transfers Into or Out of Level 3, Net	64	(273)	29	(439)
Ending Fair Value	2,126	4,258	2,126	4,258
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	4,103	3,521	4,281	3,269
Items Included in Net Income		1
Gains (Losses) in OCI and Other	205	24	(180)	94
Issuances, Sales, Maturities, Settlements, Calls, Net	(14)	171	151	371
Transfers Into or Out of Level 3, Net	50	(69)	92	(86)
Ending Fair Value	4,344	3,648	4,344	3,648
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
Ending Fair Value	5		5
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	87	110	90	109
Items Included in Net Income
Gains (Losses) in OCI and Other	(1)	3	(4)	4
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	86	113	86	113
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	1		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	1		(9)	(7)
Ending Fair Value	2		2
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
Transfers Into or Out of Level 3, Net
Ending Fair Value	1	2	1	2
ABS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	196	178	268	134
Items Included in Net Income
Gains (Losses) in OCI and Other	5	1	1	1
Issuances, Sales, Maturities, Settlements, Calls, Net	236	259	258	408
Transfers Into or Out of Level 3, Net	(13)	(118)	(103)	(223)
Ending Fair Value	424	320	424	320
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	72	78	78	75
Items Included in Net Income
Gains (Losses) in OCI and Other	4		(2)	3
Issuances, Sales, Maturities, Settlements, Calls, Net	(4)		(4)
Transfers Into or Out of Level 3, Net	18		18
Ending Fair Value	90	78	90	78
Trading Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	651	236	666	67
Items Included in Net Income	28	2	(4)	2
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	(14)	371	(20)	577
Transfers Into or Out of Level 3, Net	8	(86)	31	(123)
Ending Fair Value	673	523	673	523
Equity Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	30	25	30	25
Items Included in Net Income	(1)		(1)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net		43		43
Transfers Into or Out of Level 3, Net
Ending Fair Value	29	68	29	68
Derivative Investments [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	2,027	267	868	534
Items Included in Net Income	(1,402)	71	(405)	(312)
Gains (Losses) in OCI and Other	(12)	69	267	115
Issuances, Sales, Maturities, Settlements, Calls, Net	(18)	59	(135)	129
Transfers Into or Out of Level 3, Net
Ending Fair Value	595	466	595	466
GLB Direct Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value		439	450	123
Items Included in Net Income		(439)	(450)	(123)
GLB Direct Embedded Derivatives [Member] | Other Liabilities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	(4,596)
Items Included in Net Income	1,510	(1)	(3,086)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	(3,086)	(1)	(3,086)	(1)
GLB Ceded Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	728	50	60	72
Items Included in Net Income	(157)	61	511	39
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net
Transfers Into or Out of Level 3, Net
Ending Fair Value	571	111	571	111
GLB Ceded Embedded Derivatives [Member] | Other Liabilities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value		(8)	(9)
Items Included in Net Income		8	9	(1)
Ending Fair Value		(1)		(1)
Indexed Annuity Ceded Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	799	872	927	902
Items Included in Net Income	304	44	189	121
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	(439)	(13)	(452)	(120)
Transfers Into or Out of Level 3, Net
Ending Fair Value	664	903	664	903
Indexed Annuity And IUL Contracts [Member] | Future Contract Benefits [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	(1,380)	(1,730)	(2,585)	(1,305)
Items Included in Net Income	(831)	(154)	312	(470)
Gains (Losses) in OCI and Other
Issuances, Sales, Maturities, Settlements, Calls, Net	(61)	(89)	1	(198)
Transfers Into or Out of Level 3, Net
Ending Fair Value	$ (2,272)	$ (1,973)	$ (2,272)	$ (1,973)