Employee Benefit Plans - Narrative (Details)
£ in Millions, $ in Millions
 7 Months Ended 12 Months Ended
Aug. 01, 2021
USD ($)
Aug. 01, 2021
GBP (£)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]          
Accumulated other comprehensive loss     $ (84) $ (158)  
Funded (unfunded) status of the plan     84 10  
Defined benefit plan, net periodic benefit expense     43 50  
Cost for defined contribution retirement plans     $ 60 57 $ 57
Pension Plan | Affiliated Entity          
Defined Benefit Plan Disclosure [Line Items]          
Transaction amount $ 34 £ 26      
Pension Plan | Affiliated Entity | GXO          
Defined Benefit Plan Disclosure [Line Items]          
Accumulated other comprehensive loss $ 82        
Fixed income securities          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, target allocation percentage     88.00%    
Defined benefit plan, target allocation percentage to hedge projected liabilities     95.00%    
Equity securities          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, target allocation percentage     12.00%    
U.S. equities          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, target allocation within equity securities     50.00%    
Non-US Equity          
Defined Benefit Plan Disclosure [Line Items]          
Defined benefit plan, target allocation within equity securities     50.00%    
Postretirement Medical Plan          
Defined Benefit Plan Disclosure [Line Items]          
Funded (unfunded) status of the plan     $ (41) $ (44)  
Qualified Plans          
Defined Benefit Plan Disclosure [Line Items]          
Funded (unfunded) status of the plan     $ 156    
Expected long-term rate of return on plan assets     5.00% 5.60%  
Discount rate - net periodic benefit costs     1.96% 2.96%  
Non-Qualified Plans          
Defined Benefit Plan Disclosure [Line Items]          
Funded (unfunded) status of the plan     $ (72)    
Employer contributions     $ 5    
Minimum | Postretirement Medical Plan          
Defined Benefit Plan Disclosure [Line Items]          
Discount rate - net periodic benefit costs     1.56% 2.66% 3.87%
Minimum | Qualified Plans          
Defined Benefit Plan Disclosure [Line Items]          
Expected long-term rate of return on plan assets         5.80%
Discount rate - net periodic benefit costs         4.08%
Minimum | Non-Qualified Plans          
Defined Benefit Plan Disclosure [Line Items]          
Discount rate - net periodic benefit costs     1.11% 2.40% 3.65%
Maximum | Postretirement Medical Plan          
Defined Benefit Plan Disclosure [Line Items]          
Discount rate - net periodic benefit costs     2.34% 3.22% 4.36%
Maximum | Non-Qualified Plans          
Defined Benefit Plan Disclosure [Line Items]          
Discount rate - net periodic benefit costs     1.71% 2.78% 3.95%