Investments in Securities - Available-for-sale Securities Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Less than 12 consecutive months, gross unrealized losses	$ (13)	$ (8)
Less than 12 consecutive months, fair value	169	228
12 consecutive months or longer, gross unrealized losses	(10)	(6)
12 consecutive months or longer, fair value	159	102
Gross realized gains	0	59	$ 57
Proceeds from sales of available-for-sale securities	0	582	361
Net unrealized gains (losses) on AFS securities for which we have not recorded an allowance for credit losses	(13)	9	74
Net unrealized gains (losses) on AFS securities for which we have recorded an allowance for credit losses	0	(2)	0
Other	48	31	42
Accumulated other comprehensive income	35	38	$ 116
Agency securities
Debt Securities, Available-for-sale [Line Items]
Less than 12 consecutive months, gross unrealized losses	(12)	(5)
Less than 12 consecutive months, fair value	161	225
12 consecutive months or longer, gross unrealized losses	(10)	(6)
12 consecutive months or longer, fair value	159	102
Other
Debt Securities, Available-for-sale [Line Items]
Less than 12 consecutive months, gross unrealized losses	(1)	(3)
Less than 12 consecutive months, fair value	8	3
12 consecutive months or longer, gross unrealized losses	0	0
12 consecutive months or longer, fair value	$ 0	$ 0