Goodwill - Schedule of Carrying Amount of Goodwill (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Goodwill [Roll Forward]
Beginning balance		$ 2,752
Ending balance	$ 2,752	2,752
Consumer Bank
Goodwill [Roll Forward]
Beginning balance		1,819
Ending balance	1,819	1,819
Commercial Bank
Goodwill [Roll Forward]
Beginning balance		933
Ending balance	$ 933	$ 933