Fee-based Revenue from Contracts with Customers - Corporate & Institutional Banking Noninterest Income Disaggregation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Noninterest income	$ 8,564	$ 6,955	$ 6,874
Corporate & Institutional Banking
Disaggregation of Revenue [Line Items]
Noninterest income	3,783	3,062	2,537
Corporate & Institutional Banking | In-Scope Corporate and Institutional Banking Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	2,500	1,850	1,566
Corporate & Institutional Banking | Out-of-Scope Corporate and Institutional Banking Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	1,283	1,212	971
Corporate & Institutional Banking | Treasury management fees | In-Scope Corporate and Institutional Banking Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	1,159	897	840
Corporate & Institutional Banking | Capital markets fees | In-Scope Corporate and Institutional Banking Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	1,110	759	547
Corporate & Institutional Banking | Commercial mortgage banking activities | In-Scope Corporate and Institutional Banking Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	141	111	102
Corporate & Institutional Banking | Other | In-Scope Corporate and Institutional Banking Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	$ 90	$ 83	$ 77