Fair Value of Financial Instruments (Fair Value Measured On A Recurring Basis Reconciliation) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2019		Mar. 31, 2018
Level 3 Unobservable Input Reconciliation
Beginning Fair Value		$ 4,014		$ 3,139
Items Included in Net Income		(337)		540
Gains (Losses) in OCI and Other	[1]	120		(4)
Issuances, Sales, Maturities, Settlements, Calls, Net		409		62
Transfers Into or Out of Level 3, Net	[2]	(166)		(232)	[3]
Ending Fair Value		4,040		3,505
Corporate Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	3,269		3,091
Items Included in Net Income	[4]	(1)		3
Gains (Losses) in OCI and Other	[1],[4]	70		17
Issuances, Sales, Maturities, Settlements, Calls, Net	[4]	200		74
Transfers Into or Out of Level 3, Net	[2],[4]	(17)		7	[3]
Ending Fair Value	[4]	3,521		3,192
ABS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	29		27
Items Included in Net Income	[4]
Gains (Losses) in OCI and Other	[1],[4]			(1)
Issuances, Sales, Maturities, Settlements, Calls, Net	[4]	52
Transfers Into or Out of Level 3, Net	[2],[4]				[3]
Ending Fair Value	[4]	81		26
U.S. Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]			5
Ending Fair Value	[4]			5
Foreign Government Bonds [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	109		110
Items Included in Net Income	[4]
Gains (Losses) in OCI and Other	[1],[4]	1		(2)
Issuances, Sales, Maturities, Settlements, Calls, Net	[4]
Transfers Into or Out of Level 3, Net	[2],[4]
Ending Fair Value	[4]	110		108
RMBS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	7		12
Items Included in Net Income	[4]
Gains (Losses) in OCI and Other	[1],[4]
Issuances, Sales, Maturities, Settlements, Calls, Net	[4]
Transfers Into or Out of Level 3, Net	[2],[4]	(7)		(12)	[3]
Ending Fair Value	[4]
CMBS [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	2		6
Items Included in Net Income	[4]			1
Gains (Losses) in OCI and Other	[1],[4]
Issuances, Sales, Maturities, Settlements, Calls, Net	[4]			20
Transfers Into or Out of Level 3, Net	[2],[4]
Ending Fair Value	[4]	2		27
CLOs [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	105		91
Items Included in Net Income	[4]
Gains (Losses) in OCI and Other	[1],[4]
Issuances, Sales, Maturities, Settlements, Calls, Net	[4]	97		2
Transfers Into or Out of Level 3, Net	[2],[4]	(105)		(91)	[3]
Ending Fair Value	[4]	97		2
Hybrid And Redeemable Preferred Securities [Member] | Fixed Maturity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	75		76
Items Included in Net Income	[4]
Gains (Losses) in OCI and Other	[1],[4]	3		1
Issuances, Sales, Maturities, Settlements, Calls, Net	[4]
Transfers Into or Out of Level 3, Net	[2],[4]
Ending Fair Value	[4]	78		77
Equity AFS Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]			162
Transfers Into or Out of Level 3, Net	[2],[3],[4]			(162)
Trading Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	67		49
Items Included in Net Income	[4]			(2)
Gains (Losses) in OCI and Other	[1],[4]
Issuances, Sales, Maturities, Settlements, Calls, Net	[4]	206
Transfers Into or Out of Level 3, Net	[2],[4]	(37)
Ending Fair Value	[4]	236		47
Equity Securities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	25
Items Included in Net Income	[4]
Gains (Losses) in OCI and Other	[1],[4]
Issuances, Sales, Maturities, Settlements, Calls, Net			[4]	1
Transfers Into or Out of Level 3, Net	[2]		[4]	26	[3]
Ending Fair Value		25	[4]	27
Derivative Investments [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[4]	534		30
Items Included in Net Income	[4]	(383)		329
Gains (Losses) in OCI and Other	[1],[4]	46		(19)
Issuances, Sales, Maturities, Settlements, Calls, Net	[4]	70		(61)
Transfers Into or Out of Level 3, Net	[2],[4]
Ending Fair Value	[4]	267		279
GLB Direct Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[5]	123		903
Items Included in Net Income	[5]	316		207
Gains (Losses) in OCI and Other	[1],[5]
Issuances, Sales, Maturities, Settlements, Calls, Net	[5]
Transfers Into or Out of Level 3, Net	[2],[5]
Ending Fair Value	[5]	439		1,110
GLB Ceded Embedded Derivatives [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[5]	72		51
Items Included in Net Income	[5]	(22)		(6)
Gains (Losses) in OCI and Other	[1],[5]
Issuances, Sales, Maturities, Settlements, Calls, Net	[5]
Transfers Into or Out of Level 3, Net	[2],[5]
Ending Fair Value	[5]	50		45
GLB Ceded Embedded Derivatives [Member] | Other Liabilities [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[5]			(67)
Items Included in Net Income	[5]	(8)		(44)
Gains (Losses) in OCI and Other	[1],[5]
Issuances, Sales, Maturities, Settlements, Calls, Net	[5]
Transfers Into or Out of Level 3, Net	[2],[5]
Ending Fair Value	[5]	(8)		(111)
Indexed Annuity And IUL Contracts [Member] | Other Assets [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[5]	902		11
Items Included in Net Income	[5]	77
Gains (Losses) in OCI and Other	[1],[5]
Issuances, Sales, Maturities, Settlements, Calls, Net	[5]	(107)		6
Transfers Into or Out of Level 3, Net	[2],[5]
Ending Fair Value	[5]	872		17
Indexed Annuity And IUL Contracts [Member] | Future Contract Benefits [Member]
Level 3 Unobservable Input Reconciliation
Beginning Fair Value	[5]	(1,305)		(1,418)
Items Included in Net Income	[5]	(316)		52
Gains (Losses) in OCI and Other	[1],[5]
Issuances, Sales, Maturities, Settlements, Calls, Net	[5]	(109)		20
Transfers Into or Out of Level 3, Net	[2],[5]
Ending Fair Value	[5]	$ (1,730)		$ (1,346)

[1] The changes in fair value of the interest rate swaps are offset by an adjustment to derivative investments (see Note 6).

[2] Transfers into or out of Level 3 for AFS and trading securities are reported at amortized cost as of the beginning-of-year. For AFS and trading securities, the difference between beginning-of-year amortized cost and beginning-of-year fair value was included in OCI and earnings, respectively, in the prior period.

[3] Transfers into or out of Level 3 for FHLB stock between equity securities and other investments are reported at cost on our Consolidated Balance Sheets.

[4] Amortization and accretion of premiums and discounts are included in net investment income on our Consolidated Statements of Comprehensive Income (Loss). Gains (losses) from sales, maturities, settlements and calls and OTTI are included in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).

[5] Gains (losses) from sales, maturities, settlements and calls are included in realized gain (loss) on our Consolidated Statements of Comprehensive Income (Loss).