Shares And Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Unrealized Gain (Loss) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	$ (8,916)	$ 9,616
Change in future contract benefits and other policyholder account balances	27	2,395
Income tax benefit (expense)	707	5,399
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(1,145)	(9)
Income tax benefit (expense)	240	2
Balance as of end-of-period	(10,703)	(10,268)
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	(3,405)	(27,065)
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	(21)	(620)
Unrealized Gain (Loss) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	388	(85)
Income tax benefit (expense)	(55)	(194)
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	68	67
Income tax benefit (expense)	(14)	(14)
Balance as of end-of-period	540	592
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	231	301
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	30	623
Policyholder Liability Discount Rate Remeasurement Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	747	(1,265)
Income tax benefit (expense)	(73)	(561)
Less:
Balance as of end-of-period	1,021	805
Policyholder Liability Discount Rate Remeasurement Gain (Loss) [Member] | Gains (Losses) Arising During The Year [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	347	2,631
Market Risk Benefit NPR Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	1,741	1,951
Income tax benefit (expense)	202	(61)
Less:
Balance as of end-of-period	999	2,175
Market Risk Benefit NPR Gain (Loss) [Member] | Gains (Losses) Arising During The Year [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	(944)	285
Foreign Currency Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	(34)	(14)
Less:
Balance as of end-of-period	(33)	(47)
Foreign Currency Translation Adjustment [Member] | Gains (Losses) Arising During The Year [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	1	(32)
Funded Status of Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	(278)	(219)
Less:
Balance as of end-of-period	(304)	(197)
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	$ (26)	$ 22