v3.22.0.1
Employee Compensation and Benefit Plans - Pension Plan (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Plan Assets, Allocation [Line Items]    
Expected long-term rate of return on plan assets 4.00% 5.00%
Actual rate of return on plan assets during period 8.00% 21.00%
Expected long-term rate of return on investments 5.00%  
Interest on projected benefit obligations $ 61 $ 52
Expected return on pension plan assets (56) (45)
Net pension expense $ 5 $ 7
Percent at quoted price 14.00% 12.00%
Percent at similar assets 81.00% 85.00%
Percent supported at unobservable inputs 5.00% 3.00%
Postretirement benefit plan assets $ 1,500 $ 1,400
Projected benefit obligations 2,200 2,300
Underfunded plan $ 633 $ (828)
Discount rate 3.00% 3.00%
Contributions to benefit plan $ 83 $ 58
Expected future contributions 37  
Expected payment, year one 100  
Expected payment, years two and three 206  
Expected payment, years four and five 215  
Expected payment, thereafter $ 562  
Defined Benefit Plan, Equity Securities, US    
Defined Benefit Plan, Plan Assets, Allocation [Line Items]    
Target allocation, percentage 41.00%  
Fixed Income Securities    
Defined Benefit Plan, Plan Assets, Allocation [Line Items]    
Target allocation, percentage 44.00%  
Defined Benefit Plan, Real Estate    
Defined Benefit Plan, Plan Assets, Allocation [Line Items]    
Target allocation, percentage 11.00%  
Hedge Funds    
Defined Benefit Plan, Plan Assets, Allocation [Line Items]    
Target allocation, percentage 4.00%