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Leases - Operating Leases as Lessee (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description    
Options to extend the lease term true  
Options to terminate the lease early true  
Lease, Cost    
Operating lease cost $ 329 $ 314
Cash paid for amounts included in the measurement of operating lease liabilities 264 253
ROU assets arising from entering into new operating lease obligations $ 396 $ 310
Weighted average remaining lease term at December 31 (in years) 8 years 8 years
Weighted average discount rate at December 31 3.20% 3.90%
Minimum    
Lessee, Lease, Description    
Operating lease contract term 1 year  
Maximum    
Lessee, Lease, Description    
Operating lease contract term 10 years  
Operating lease renewal term 10 years