Fair Values (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Investment securities:
Equity securities	$ 41	$ 79
Debt securities	4,537	2,512
Derivatives, gross	521	590
Total Assets	5,099	3,181
Liabilities
Derivatives, gross	801	139
Total Liabilities	801	139
Fair Value, Inputs, Level 1
Investment securities:
Equity securities	40	78
Debt securities	0	0
Derivatives, gross	0	0
Total Assets	40	78
Liabilities
Derivatives, gross	0	0
Total Liabilities	0	0
Fair Value, Inputs, Level 2
Investment securities:
Equity securities	1	1
Debt securities	4,490	2,480
Derivatives, gross	494	590
Total Assets	4,985	3,071
Liabilities
Derivatives, gross	801	139
Total Liabilities	801	139
Fair Value, Inputs, Level 3
Investment securities:
Equity securities	0	0
Debt securities	47	32
Derivatives, gross	27	0
Total Assets	74	32
Liabilities
Derivatives, gross	0	0
Total Liabilities	$ 0	$ 0