Derivatives (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Derivatives, Fair Value [Line Items]
Estimated Fair Value Assets	$ 10,466	$ 11,866
Estimated Fair Value Liabilities	3,852	4,229
Maximum Amount of Future Payments under Credit Default Swaps	8,626	9,609
Estimated Fair Value of Credit Default Swaps	165	196
Excess cash collateral received on derivatives	172	$ 265
Securities collateral received which the company is permitted to sell or repledge, amount that has been sold or repledged	$ 0
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Average Remaining Maturity	4 years 7 months 6 days	4 years 9 months 18 days
Net investment gains (losses)	$ 1,529	$ (110)	$ 444
Derivative Instrument Detail [Abstract]
Net amounts reclassified into net derivatives gains (losses) on discontinued cash flow hedges	$ (1)	$ 21	58
Hedging exposure to variability in future cash flows for specific length of time	7 years	8 years
Accumulated Other Comprehensive Income Loss	$ 2,100	$ 1,900
Deferred net gains (losses) expected to be reclassified to earnings	(91)
Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) for net investment in foreign operations hedges	303	164
Excess securities collateral provided on derivatives	126	238
Ba [Member]
Derivatives, Fair Value [Line Items]
Maximum Amount of Future Payments under Credit Default Swaps	102	0
Estimated Fair Value of Credit Default Swaps	$ 0	$ 0
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Average Remaining Maturity	2 years	0 years
Nonperformance Risk [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Embedded derivative gains (losses)	$ (17)	$ (10)	(116)
Over the Counter [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset	6,948	6,842
Excess securities collateral received on derivatives	(160)	(231)
Excess securities collateral provided on derivatives	(243)	(269)
Exchange Cleared [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset	421	530
Excess securities collateral provided on derivatives	(1,200)	(2,100)
Exchange Traded [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Collateral, Obligation to Return Cash, Offset	0	0
Excess securities collateral provided on derivatives	(185)	(318)
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Net investment gains (losses)	82	207	$ 8
Credit Index Product [Member] | Ba [Member]
Derivatives, Fair Value [Line Items]
Maximum Amount of Future Payments under Credit Default Swaps	20	0
Estimated Fair Value of Credit Default Swaps	$ (1)	$ 0
Derivative Instruments, Gain (Loss) [Line Items]
Derivative, Average Remaining Maturity	5 years	0 years
Accrued Liabilities [Member]
Derivatives, Fair Value [Line Items]
Estimated Fair Value Assets	$ 130	$ 92
Estimated Fair Value Liabilities	$ (23)	$ (58)