Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 152	$ 222	$ 448	$ 384
Other comprehensive income, net of tax
Investment securities	(8)	0	(25)	55
Derivatives and hedging activities	1	0	16	(10)
Other comprehensive income, net of tax	(7)	0	(9)	45
Comprehensive income	$ 145	$ 222	$ 439	$ 429