Shares and Stockholder's Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 8,604
Less:
Balance	7,318	$ 6,884
Unrealized Gain (Loss) on AFS Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(8,526)	9,153
Income tax benefit (expense)	478	5,159
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(3,704)	(9)
Income tax benefit (expense)	778	2
Balance	(7,433)	(9,834)
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	(2,781)	(25,928)
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 AFS Securities [Member] | Change in Deferred Insurance Charges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss) before reclassifications and taxes	491	2,395
Unrealized Gain (Loss) on Derivative Instruments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	301	258
Income tax benefit (expense)	(9)	(87)
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	46	78
Income tax benefit (expense)	(10)	(16)
Balance	296	518
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	10	(214)
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
Market Risk Benefit Non-Performance Risk Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	1,739	1,951
Income tax benefit (expense)	202	(61)
Less:
Balance	997	2,175
Market Risk Benefit Non-Performance Risk 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
Policyholder Liability Discount Rate Remeasurement Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	790	(1,101)
Income tax benefit (expense)	(69)	(527)
Less:
Balance	1,047	842
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	326	2,470
Funded Status of Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(17)	(11)
Less:
Balance	$ (17)	$ (11)