Fee-based Revenue from Contracts with Customers - Asset Management Group 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
Asset Management Fees
Disaggregation of Revenue [Line Items]
Noninterest income	964
Brokerage fees
Disaggregation of Revenue [Line Items]
Noninterest income	9
Asset Management Group
Disaggregation of Revenue [Line Items]
Noninterest income	987	854	991
Asset Management Group | In-Scope Asset Management Group Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	973	836	862
Asset Management Group | Out-of-Scope Asset Management Group Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	14	18	129
Asset Management Group | PNC Private Bank | In-Scope Asset Management Group Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	752	634	620
Asset Management Group | Institutional Asset Management | In-Scope Asset Management Group Noninterest Income
Disaggregation of Revenue [Line Items]
Noninterest income	$ 221	$ 202	$ 242