Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 8,604
Less:
Balance	10,203	$ 19,775
Unrealized Gain (Loss) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(8,526)	9,153
Income tax benefit (expense)	(455)	1,962
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(37)	(3)
Income tax benefit (expense)	8	1
Balance	(6,830)	1,932
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	2,307	(10,038)
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	75	(70)
Unrealized Gain (Loss) on AFS Securities [Member] | Change in Deferred Insurance Charges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	(260)	923
Unrealized Gain (Loss) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	301	258
Income tax benefit (expense)	(25)	18
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	16	17
Income tax benefit (expense)	(3)	(4)
Balance	382	179
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	186	(159)
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	(67)	75
Market Risk Benefit NPR Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,739	1,951
Income tax benefit (expense)	(280)	(6)
Less:
Balance	2,765	1,971
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	1,306	26
Policyholder Liability Discount Rate Remeasurement Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	790	(1,101)
Income tax benefit (expense)	53	(206)
Less:
Balance	600	(342)
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	(243)	965
Funded Status of Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(17)	(11)
Income tax benefit (expense)		(1)
Less:
Balance	$ (17)	$ (12)