Shares And Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Unrealized Gain (Loss) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	$ 9,611	$ 5,983	$ 557
Change in DAC, VOBA, DSI and DFEL	1,815	(3,569)	(2,462)
Income tax benefit (expense)	774	(970)	(1,457)
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(9)	(53)	(28)
Associated amortization of DAC, VOBA, DSI, and DFEL	(24)	32	(12)
Income tax benefit (expense)	7	4	8
Decreases attributable to
Balance as of end-of-period	6,777	9,611	5,983
Unrealized Gain (Loss) on AFS Securities [Member] | Gains (Losses) Arising During The Year [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	(5,304)	7,925	9,267
Unrealized Gain (Loss) on AFS Securities [Member] | Change in Foreign Currency Exchange Rate Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	(145)	180	46
Unrealized OTTI on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year		45	33
(Increases) attributable to:
Gross OTTI recognized in OCI during the period			(16)
Change in DAC, VOBA, DSI and DFEL			1
Income tax benefit (expense)			(3)
Decreases attributable to
Changes in fair value, sales, maturities or other settlements of AFS securities			31
Change in DAC, VOBA, DSI, and DFEL			(1)
Income tax benefit (expense)			(6)
Balance as of end-of-period			45
Unrealized Gain (Loss) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	(402)	(11)	139
Change in DAC, VOBA, DSI and DFEL	8	(17)	(4)
Income tax benefit (expense)	(87)	94	31
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	26	48	42
Associated amortization of DAC, VOBA, DSI, and DFEL	(1)	(1)	(1)
Income tax benefit (expense)	(5)	(10)	(9)
Decreases attributable to
Balance as of end-of-period	(103)	(402)	(11)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Gains (Losses) Arising During The Year [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	246	(257)	(93)
Unrealized Gain (Loss) on Derivative Instruments [Member] | Change in Foreign Currency Exchange Rate Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	152	(174)	(52)
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	(12)	(17)	(23)
Decreases attributable to
Balance as of end-of-period	(14)	(12)	(17)
Foreign Currency Translation Adjustment [Member] | Change in Foreign Currency Exchange Rate Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	(2)	5	6
Funded Status of Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	(266)	(327)	(299)
Income tax benefit (expense)	(9)	(13)	(8)
Decreases attributable to
Balance as of end-of-period	(219)	(266)	(327)
Funded Status of Employee Benefit Plans [Member] | Gains (Losses) Arising During The Year [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	$ 56	74	(20)
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unrealized Gain (Loss) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year		45
Decreases attributable to
Balance as of end-of-period			45
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unrealized OTTI on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year		$ (45)
Decreases attributable to
Balance as of end-of-period			$ (45)