Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2023	Jun. 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	(82)	1,750
Income tax benefit (expense)	(199)	3,943
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(707)	(4)
Income tax benefit (expense)	148	1
Balance as of end-of-period	(7,715)	(4,912)
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	803	(19,853)
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	120	(371)
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)	(26)	(104)
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	43	25
Income tax benefit (expense)	(9)	(5)
Balance as of end-of-period	448	290
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	230	126
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	(110)	373
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)	26	(412)
Less:
Balance as of end-of-period	657	256
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	(116)	1,933
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)	(28)	(102)
Less:
Balance as of end-of-period	1,842	2,325
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	129	476
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	(26)	(33)
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	8	(18)
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	(310)	(206)
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	$ (32)	$ 13