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Leases (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
Operating lease expense (a) $ 428  
Amortization of right-of-use assets 12  
Finance Lease, Interest Expense 5  
Total finance lease expense 17  
Sublease income (27)  
Total lease related expenses, net 418  
short term leases and variable leases costs 130  
Operating cash flows from operating leases 288  
Operating cash flows from finance leases 4  
Financing cash flows from finance leases 6  
Operating leases 257  
Finance leases 35  
OPERATING LEASE RIGHT-OF-USE ASSETS 1,092  
Operating lease liabilities 214  
LONG-TERM OPERATING LEASE LIABILITIES 979  
Total operating lease liabilities 1,193  
Finance Lease Right-of-Use Asset 172  
Current finance lease liabilities (included within accounts payable and accrued liabilities) 4  
Long-term finance lease liabilities (included within other long-term liabilities) 58  
Total finance lease liabilities $ 62  
Weighted average remaining operating lease term (in years) 6 years 7 months 6 days  
Weighted average remaining finance lease term (in years) 16 years 7 months 6 days  
Weighted average discount rate - operating leases (percentage) 4.40%  
Weighted average discount rate - finance leases (percentage) 5.70%  
Lessee, Operating Lease, Liability, Payment, Due [Abstract]    
2020 $ 265  
2021 259  
2022 221  
2023 193  
2024 155  
Thereafter 406  
Undiscounted lease cash flow commitments 1,499  
Reconciling impact from discounting (306)  
Finance Lease, Liability, Payment, Due [Abstract]    
2020 7  
2021 6  
2022 6  
2023 6  
2024 6  
Thereafter 64  
Undiscounted lease cash flow commitments 95  
Reconciling impact from discounting $ (33)  
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019   $ 286
2020   254
2021   207
2022   170
2023   143
Thereafter   440
Operating Leases, Future Minimum Payments Due   1,500
Capital Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2019   10
2020   9
2021   9
2022   9
2023   10
Thereafter   64
Capital Leases, Future Minimum Payments Due   $ 111