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Operating Leases - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Property Subject to or Available for Operating Lease [Line Items]      
Rent expense $ 294 $ 317 $ 354
Operating lease liabilities 1,012 969  
Operating right-of-use assets obtained in exchange for lease obligations 328 $ 222  
2022 243    
2023 226    
2024 198    
2025 163    
2026 135    
Thereafter 409    
Imputed interest $ 159    
Weighted average discount rate 3.50% 4.00%  
Weighted-average remaining lease term 7 years 1 month 6 days 7 years 4 months 24 days  
Payments for operating leases $ 301 $ 309 337
Amount of lease agreements not yet commenced 215    
Residual value of leased assets $ 29,100    
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] Accrued liabilities (Note 12) Accrued liabilities (Note 12)  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent Other Liabilities, Noncurrent  
Vehicles      
Property Subject to or Available for Operating Lease [Line Items]      
Operating lease right-of-use assets $ 37,929 $ 39,819  
Depreciation expense 6,100 7,200 $ 7,300
Other assets      
Property Subject to or Available for Operating Lease [Line Items]      
Operating lease right-of-use assets 1,100 1,000  
Accrued liabilities      
Property Subject to or Available for Operating Lease [Line Items]      
Operating lease liability 204 209  
Other liabilities      
Property Subject to or Available for Operating Lease [Line Items]      
Operating lease liabilities $ 1,000 $ 969