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Employee Benefit Plans (Pension Plan Assets Fair Value Hierarchy) (Details) - PNC Pension Plan - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 5,400 $ 6,788
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1,444 2,047
Level 1 | Interest bearing cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 51  
Level 1 | Money market funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 333 725
Level 1 | U.S. government and agency securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 454 583
Level 1 | Common stock    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 605 739
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 986 1,523
Level 2 | Interest bearing cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 11
Level 2 | U.S. government and agency securities    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 136 124
Level 2 | Corporate debt    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 699 962
Level 2 | Mutual funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 150 278
Level 2 | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1 148
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2 5
Level 3 | Corporate debt    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2 4
Level 3 | Common stock    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 1
Fair Value, Inputs, Level 1, 2 and 3 | Interest bearing cash    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 51 11
Fair Value, Inputs, Level 1, 2 and 3 | Money market funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 333 725
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 590 707
Fair Value, Inputs, Level 1, 2 and 3 | Corporate debt    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 701 966
Fair Value, Inputs, Level 1, 2 and 3 | Common stock    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 605 740
Fair Value, Inputs, Level 1, 2 and 3 | Mutual funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 150 278
Fair Value, Inputs, Level 1, 2 and 3 | Other    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets 2 148
Fair Value Measured at Net Asset Value Per Share    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets $ 2,968 $ 3,213