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Employee Benefit Plans (Pension Plan Assets Fair Value Hierarchy) (Details) - PNC Pension Plan - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 5,615 | $ 5,400
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,342 | 1,444
Level 1 | Interest-bearing cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 46 | 51
Level 1 | Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 186 | 333
Level 1 | U.S. government and agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 394 | 454
Level 1 | Common stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 716 | 605
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 | 1,086 | 986
Level 2 | Interest-bearing cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  |
Level 2 | U.S. government and agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 145 | 136
Level 2 | Corporate debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 749 | 699
Level 2 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 160 | 150
Level 2 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 32 | 1
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2 | 2
Level 3 | Corporate debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 2 | 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 | 46 | 51
Fair Value, Inputs, Level 1, 2 and 3 | Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 186 | 333
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 | 539 | 590
Fair Value, Inputs, Level 1, 2 and 3 | Corporate debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 751 | 701
Fair Value, Inputs, Level 1, 2 and 3 | Common stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 716 | 605
Fair Value, Inputs, Level 1, 2 and 3 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 160 | 150
Fair Value, Inputs, Level 1, 2 and 3 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 32 | 2
Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 3,185 | $ 2,968

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