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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