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Employee Benefit Plans (Pension Plan Assets Fair Value Hierarchy) (Details) - PNC Pension Plan - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 6,073 | $ 5,654
Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1,757 | 1,658
Level 1 | Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 572 | 456
Level 1 | U.S. government and agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 446 | 582
Level 1 | Common stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 738 | 620
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 | 1,360 | 1,176
Level 2 | Interest bearing cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 1
Level 2 | U.S. government and agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 126 | 135
Level 2 | Corporate debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 730 | 660
Level 2 | Common stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 1
Level 2 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 290 | 253
Level 2 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 214 | 126
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 4 | 8
Level 3 | U.S. government and agency securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 1
Level 3 | Corporate debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 3 | 3
Level 3 | Common stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 1 | 4
Fair Value, Inputs, Level 1, 2 and 3 | Interest bearing cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets |  | 1
Fair Value, Inputs, Level 1, 2 and 3 | Money market funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 572 | 456
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 | 572 | 718
Fair Value, Inputs, Level 1, 2 and 3 | Corporate debt |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 733 | 663
Fair Value, Inputs, Level 1, 2 and 3 | Common stock |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 739 | 625
Fair Value, Inputs, Level 1, 2 and 3 | Mutual funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 290 | 253
Fair Value, Inputs, Level 1, 2 and 3 | Other |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | 215 | 126
Fair Value Measured at Net Asset Value Per Share |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Fair value of plan assets | $ 2,952 | $ 2,812

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