Consolidated Statements of Comprehensive Income - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 116,000,000	$ 61,000,000	$ 161,000,000	$ 97,000,000
Other comprehensive income, net of tax
Investment securities	21,000,000	23,000,000	55,000,000	39,000,000
Derivatives and hedging activities	(6,000,000)	0	(10,000,000)	0
Other comprehensive income, net of tax	15,000,000	23,000,000	45,000,000	39,000,000
Comprehensive income	$ 131,000,000	$ 84,000,000	$ 206,000,000	$ 136,000,000