Parent Company Financial Information - Statements of Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investments in subsidiaries:
Other assets	$ 4,080	$ 3,542
Total assets	78,953	89,092
Liabilities and equity:
Term borrowings	1,597	1,590
Total liabilities	70,406	80,598
Total equity	8,547	8,494	$ 8,307	$ 5,076
Total liabilities and equity	78,953	89,092
Parent Company
Assets:
Cash	1,335	724
Notes receivable	3	3
Investments in subsidiaries:
Bank	7,861	8,381
Non-bank	42	65
Other assets	251	291
Total assets	9,492	9,464
Liabilities and equity:
Accrued employee benefits and other liabilities	293	321
Term borrowings	948	944
Total liabilities	1,241	1,265
Total equity	8,251	8,199
Total liabilities and equity	$ 9,492	$ 9,464