Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 222,000,000	$ 63,000,000	$ 384,000,000	$ 160,000,000
Other comprehensive income, net of tax
Investment securities	0	13,000,000	55,000,000	52,000,000
Derivatives and hedging activities	0	0	(10,000,000)	0
Other comprehensive income, net of tax	0	13,000,000	45,000,000	52,000,000
Comprehensive income	$ 222,000,000	$ 76,000,000	$ 429,000,000	$ 212,000,000