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Leases Lease-Related Assets and Liabilities (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Operating lease right-of-use assets $ 1,352,000,000 $ 0
Finance lease right-of-use asset 835,000,000  
Finance Lease, Right of Use Asset, Accumulated Depreciation 430,000,000  
Total lease assets 2,187,000,000  
Current operating lease liabilities 332,000,000 0
Finance lease, current maturities of long-term debt 86,000,000  
Noncurrent operating lease liabilities 1,014,000,000 0
Finance lease, long-term debt less current maturities 586,000,000  
Total lease liabilities 2,018,000,000  
Less allowance for depreciation and amortization 10,445,000,000 $ 9,731,000,000
Finance Lease    
Finance lease, current maturities of long-term debt 86,000,000  
Finance lease, long-term debt less current maturities $ 586,000,000