Fair Values (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Investment securities:
Equity securities	$ 43	$ 79
Debt securities	4,496
Derivatives, gross	1,895	590
Liabilities
Derivatives, gross	568	139
Fair Value, Recurring
Investment securities:
Equity securities	43	79
Debt securities	4,496	2,512
Derivatives, gross	1,895	590
Total Assets	6,434	3,181
Liabilities
Derivatives, gross	568	139
Total Liabilities	568	139
Level 1 | Fair Value, Recurring
Investment securities:
Equity securities	42	78
Debt securities	0	0
Derivatives, gross	0	0
Total Assets	42	78
Liabilities
Derivatives, gross	0	0
Total Liabilities	0	0
Level 2 | Fair Value, Recurring
Investment securities:
Equity securities	1	1
Debt securities	4,464	2,480
Derivatives, gross	1,876	590
Total Assets	6,341	3,071
Liabilities
Derivatives, gross	568	139
Total Liabilities	568	139
Level 3 | Fair Value, Recurring
Investment securities:
Equity securities	0	0
Debt securities	32	32
Derivatives, gross	19	0
Total Assets	51	32
Liabilities
Derivatives, gross	0	0
Total Liabilities	$ 0	$ 0