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Leases Maturity of Lease Liabilities (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Current operating lease liabilities $ 332 $ 0
Finance lease, current maturities of long-term debt 86  
Noncurrent operating lease liabilities 1,014 $ 0
Finance lease, long-term debt less current maturities 586  
Operating Lease    
Remainder of 2019 115  
2020 347  
2021 213  
2022 141  
2023 111  
Thereafter 753  
Total lease payments 1,680  
Less imputed interest (334)  
Total lease obligations 1,346  
Current operating lease liabilities 332  
Noncurrent operating lease liabilities 1,014  
Finance Lease    
Remainder of 2019 28  
2020 109  
2021 104  
2022 101  
2023 97  
Thereafter 338  
Total lease payments 777  
Less imputed interest (105)  
Total lease obligations 672  
Finance lease, current maturities of long-term debt 86  
Finance lease, long-term debt less current maturities $ 586