Fair Values (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Investment securities:
Equity securities	$ 79	$ 81
Debt securities	2,512	21,550
Derivatives, gross	590	629
Total Assets	3,181	22,260
Liabilities
Derivatives, gross	139	702
Total Liabilities	139	702
Fair Value, Inputs, Level 1
Investment securities:
Equity securities	78	80
Debt securities	0	0
Derivatives, gross	0	0
Total Assets	78	80
Liabilities
Derivatives, gross	0	0
Total Liabilities	0	0
Fair Value, Inputs, Level 2
Investment securities:
Equity securities	1	1
Debt securities	2,480	21,550
Derivatives, gross	590	629
Total Assets	3,071	22,180
Liabilities
Derivatives, gross	139	702
Total Liabilities	139	702
Fair Value, Inputs, Level 3
Investment securities:
Equity securities	0	0
Debt securities	32	0
Derivatives, gross	0	0
Total Assets	32	0
Liabilities
Derivatives, gross	0	0
Total Liabilities	$ 0	$ 0