Shares and Stockholders' Equity (Components And Changes In Accumulated OCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 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	(260)	921
Income tax benefit (expense)	(465)	2,057
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(39)	(2)
Income tax benefit (expense)	8
Balance as of end-of-period	(7,177)	2,032
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	2,357	(10,493)
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	76	(71)
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)	(15)	(24)
Less:
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	22	11
Income tax benefit (expense)	(5)	(2)
Balance as of end-of-period	423	1
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	134	44
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
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)	56	(220)
Less:
Balance as of end-of-period	545	(454)
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	(258)	1,031
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)	(281)	(5)
Less:
Balance as of end-of-period	2,766	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	25
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	(31)	(19)
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	3	(5)
Funded Status of Employee Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance as of beginning-of-year	(278)	(219)
Income tax benefit (expense)		(1)
Less:
Balance as of end-of-period	(280)	(216)
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	$ (2)	$ 4