Fair Values (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Investment securities:
Equity securities	$ 49	$ 79
Debt securities	4,016
Derivatives, gross	766	590
Liabilities
Derivatives, gross	306	139
Fair Value, Recurring
Investment securities:
Equity securities	49	79
Debt securities	4,016	2,512
Derivatives, gross	766	590
Total Assets	4,831	3,181
Liabilities
Derivatives, gross	306	139
Total Liabilities	306	139
Level 1 | Fair Value, Recurring
Investment securities:
Equity securities	48	78
Debt securities	0	0
Derivatives, gross	0	0
Total Assets	48	78
Liabilities
Derivatives, gross	0	0
Total Liabilities	0	0
Level 2 | Fair Value, Recurring
Investment securities:
Equity securities	1	1
Debt securities	3,984	2,480
Derivatives, gross	747	590
Total Assets	4,732	3,071
Liabilities
Derivatives, gross	306	139
Total Liabilities	306	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