Employee Benefit Plans (Pension Plan Assets Fair Value Hierarchy) (Details) - PNC Pension Plan - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 5,506	$ 5,615
Level 1
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,078	1,342
Level 1 | Interest-bearing cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56	46
Level 1 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	220	186
Level 1 | U.S. government and agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	391	394
Level 1 | Common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	410	716
Level 1 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1
Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,173	1,086
Level 2 | U.S. government and agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	302	145
Level 2 | Corporate debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	684	749
Level 2 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	147	160
Level 2 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	40	32
Level 3
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	2
Level 3 | Corporate debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	2
Level 3 | Common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets
Fair Value, Inputs, Level 1, 2 and 3 | Interest-bearing cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	56	46
Fair Value, Inputs, Level 1, 2 and 3 | Money market funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	220	186
Fair Value, Inputs, Level 1, 2 and 3 | U.S. government and agency securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	693	539
Fair Value, Inputs, Level 1, 2 and 3 | Corporate debt
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	685	751
Fair Value, Inputs, Level 1, 2 and 3 | Common stock
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	410	716
Fair Value, Inputs, Level 1, 2 and 3 | Mutual funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	147	160
Fair Value, Inputs, Level 1, 2 and 3 | Other
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	41	32
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 3,254	$ 3,185