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Lease Commitments - Balance Sheets (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating Leases    
Right-of-use asset $ 3,949 $ 4,074
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesCurrent
Operating lease liability, current $ 1,291 $ 1,277
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesNoncurrent us-gaap:OtherLiabilitiesNoncurrent
Noncurrent operating lease liabilities $ 2,615 $ 2,608
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities us-gaap:OtherLiabilities
Total operating lease liabilities $ 3,906 $ 3,885
Weighted-average remaining lease term (in years) 7 years 2 months 12 days 5 years 2 months 12 days
Weighted-average discount rate 2.80% 3.20%
Finance Leases    
Right-of-use asset $ 455 $ 329
Current lease liabilities 186 18
Noncurrent lease liabilities 447 282
Finance lease liability $ 633 $ 300
Weighted-average remaining lease term (in years) 10 years 4 months 24 days 16 years
Weighted-average discount rate 3.90% 4.70%
Right-of-use asset obtained in exchange for operating lease liability $ 1,353 $ 1,201
Right-of-use asset obtained in exchange for finance lease liability 164 $ 184
Puma    
Operating Leases    
Right-of-use asset 566  
Total operating lease liabilities 566  
Noble    
Operating Leases    
Right-of-use asset 124  
Total operating lease liabilities 148  
Finance Leases    
Right-of-use asset 112  
Finance lease liability $ 309