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Leases (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Assets and Liabilities, Lessee [Abstract]    
Operating lease right-of-use assets $ 461 $ 443
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent us-gaap:AccountsPayableAndAccruedLiabilitiesCurrent
Operating Lease, Liability, Current $ 89 $ 93
Operating lease liabilities 376 355
Operating Lease, Liability $ 465 $ 448
Operating Lease, Weighted Average Remaining Lease Term 8 years 8 years
Operating Lease, Weighted Average Discount Rate, Percent 3.10% 3.50%
Lease, Cost [Abstract]    
Operating Lease, Cost $ 117 $ 113
Short-term Lease, Cost 70 58
Lease, Cost 187 171
Operating Leased Assets [Line Items]    
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months 102  
Lessee, Operating Lease, Liability, Payments, Due Year Two 85  
Lessee, Operating Lease, Liability, Payments, Due Year Three 69  
Lessee, Operating Lease, Liability, Payments, Due Year Four 54  
Lessee, Operating Lease, Liability, Payments, Due Year Five 42  
Lessee, Operating Lease, Liability, Payments, Due after Year Five 171  
Lessee, Operating Lease, Liability, Payments, Due 523  
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (58)  
Fixed Lease Payments [Member] | Affiliates [Member]    
Lease, Cost [Abstract]    
Operating Lease, Cost 12 18
Affiliates [Member]    
Assets and Liabilities, Lessee [Abstract]    
Operating lease right-of-use assets $ 41 $ 50