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Debt, Credit Facilities, and Commitments and Contingencies - Future Minimum Operating Lease Payments, Capital Lease Payments and Debt Maturities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating leases      
2019 $ 116    
2020 105    
2021 100    
2022 81    
2023 64    
Thereafter 343    
Total obligations and commitments 809    
Debt maturities and capital leases      
2019 1,612    
2020 3,755    
2021 3,053    
2022 4,120    
2023 2,250    
Thereafter 22,570    
Total obligations and commitments 37,360    
Fair value hedges, unamortized bond discounts and deferred financing costs (749)    
Total long-term debt and lease obligations 36,611 $ 36,968  
Lease expense $ 161 $ 169 $ 159