Goodwill (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Goodwill [Roll Forward]
Beginning balance	$ 2,693	$ 2,673
Goodwill acquired		20
XUP acquisition measurement period adjustment	1
Ending balance	2,694	2,693
Consumer Bank
Goodwill [Roll Forward]
Beginning balance	1,761	1,761
Goodwill acquired		0
XUP acquisition measurement period adjustment	0
Ending balance	1,761	1,761
Commercial Bank
Goodwill [Roll Forward]
Beginning balance	932	912
Goodwill acquired		20
XUP acquisition measurement period adjustment	1
Ending balance	$ 933	$ 932