Derivatives (Credit Derivatives) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ (49)	$ 165
Maximum Amount of Future Payments under Credit Default Swaps	$ 11,786	$ 8,626
Weighted Average Years to Maturity	4 years 9 months 18 days	4 years 7 months 6 days
Aaa/Aa/A
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ 7	$ 21
Maximum Amount of Future Payments under Credit Default Swaps	$ 2,901	$ 1,350
Weighted Average Years to Maturity	3 years 3 months 18 days	2 years 7 months 6 days
Aaa/Aa/A | Single name credit default swaps (3)
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ 3	$ 4
Maximum Amount of Future Payments under Credit Default Swaps	$ 159	$ 159
Weighted Average Years to Maturity	2 years 7 months 6 days	3 years 1 month 6 days
Aaa/Aa/A | Credit default swaps referencing indices
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ 4	$ 17
Maximum Amount of Future Payments under Credit Default Swaps	$ 2,742	$ 1,191
Weighted Average Years to Maturity	3 years 3 months 18 days	2 years 6 months
Baa [Member]
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ (44)	$ 148
Maximum Amount of Future Payments under Credit Default Swaps	$ 8,713	$ 7,089
Weighted Average Years to Maturity	5 years 4 months 24 days	5 years
Baa [Member] | Single name credit default swaps (3)
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ 2	$ 2
Maximum Amount of Future Payments under Credit Default Swaps	$ 101	$ 101
Weighted Average Years to Maturity	2 years 8 months 12 days	3 years 4 months 24 days
Baa [Member] | Credit default swaps referencing indices
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ (46)	$ 146
Maximum Amount of Future Payments under Credit Default Swaps	$ 8,612	$ 6,988
Weighted Average Years to Maturity	5 years 4 months 24 days	5 years
B
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ 1	$ 5
Maximum Amount of Future Payments under Credit Default Swaps	$ 55	$ 55
Weighted Average Years to Maturity	3 years 6 months	4 years
B | Credit default swaps referencing indices
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ 1	$ 5
Maximum Amount of Future Payments under Credit Default Swaps	$ 55	$ 55
Weighted Average Years to Maturity	3 years 6 months	4 years
Ba
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ (2)	$ 0
Maximum Amount of Future Payments under Credit Default Swaps	$ 87	$ 102
Weighted Average Years to Maturity	3 years 3 months 18 days	2 years
Ba | Single name credit default swaps (3)
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ 0	$ 1
Maximum Amount of Future Payments under Credit Default Swaps	$ 42	$ 82
Weighted Average Years to Maturity	2 years	1 year 2 months 12 days
Ba | Credit default swaps referencing indices
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ (2)	$ (1)
Maximum Amount of Future Payments under Credit Default Swaps	$ 45	$ 20
Weighted Average Years to Maturity	4 years 6 months	5 years
Caa3
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ (11)	$ (9)
Maximum Amount of Future Payments under Credit Default Swaps	$ 30	$ 30
Weighted Average Years to Maturity	4 years	4 years 6 months
Caa3 | Credit default swaps referencing indices
Credit Derivatives [Line Items]
Estimated Fair Value of Credit Default Swaps	$ (11)	$ (9)
Maximum Amount of Future Payments under Credit Default Swaps	$ 30	$ 30
Weighted Average Years to Maturity	4 years	4 years 6 months