Investment Securities (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Total Estimated Fair Value
Due within 1 year	$ 3,299
Due after 1 year but within 5 years	1,152
Due after 5 years but within 10 years	36
Due after 10 years	50
Total	4,537	$ 2,512
Total Estimated Fair Value
Due within 1 year	3,348
Due after 1 year but within 5 years	1,177
Due after 5 years but within 10 years	36
Due after 10 years	60
Total	$ 4,621
Weighted average yields
Weighted average yields, due within 1 year	2.63%
Weighted average yields, due after 1 years but within 5 years	3.19%
Weighted average yields, due after 5 years but within 10 years	5.06%
Weighted average yield, due after 10 years	2.85%
Weighted average yields, Total	2.80%
State and municipal obligations
Total Estimated Fair Value
Due within 1 year	$ 0
Due after 1 year but within 5 years	0
Due after 5 years but within 10 years	21
Due after 10 years	33
Total	54	111
Total Estimated Fair Value
Total	64	106
U.S. Government agency obligations
Total Estimated Fair Value
Due within 1 year	0
Due after 1 year but within 5 years	0
Due after 5 years but within 10 years	1
Due after 10 years	4
Total	5	6
Total Estimated Fair Value
Total	5	6
U.S. Government treasury obligations
Total Estimated Fair Value
Due within 1 year	2,668
Due after 1 year but within 5 years	1,109
Due after 5 years but within 10 years	9
Due after 10 years	0
Total	3,786	1,704
Total Estimated Fair Value
Total	3,859	1,680
Mortgage-backed securities
Total Estimated Fair Value
Due within 1 year	0
Due after 1 year but within 5 years	0
Due after 5 years but within 10 years	0
Due after 10 years	13
Total	13	18
Total Estimated Fair Value
Total	13	17
Foreign government bonds and obligations
Total Estimated Fair Value
Due within 1 year	631
Due after 1 year but within 5 years	1
Due after 5 years but within 10 years	0
Due after 10 years	0
Total	632	630
Total Estimated Fair Value
Total	633	630
Other
Total Estimated Fair Value
Due within 1 year	0
Due after 1 year but within 5 years	42
Due after 5 years but within 10 years	5
Due after 10 years	0
Total	47	43
Total Estimated Fair Value
Total	$ 47	$ 43