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Lease Accounting Leasee Accounting(Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2019
Rental Income, Nonoperating $ 149      
Operating Lease, Weighted Average Remaining Lease Term 24 years      
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year $ 104      
Operating Lease, Cost 117      
Operating Lease, Right-of-Use Asset 1,000 $ 0   $ 889
Operating Lease, Liability, Current 60 0   71
Accrued and other current liabilities 3,342 2,918   2,917
Operating Lease, Liability, Noncurrent 901 0   823
Property, Plant and Equipment, Net 74,193 66,963   66,962
Current maturities of long-term debt 26 2,655   2,656
Long-term debt, less current maturities 51,028 43,373   43,379
Other non-current liabilities 1,162 1,184   $ 1,172
Finance Lease, Interest Expense 1      
Lease, Cost 136      
Lease, Cost, Gross 183      
Net Cash Provided by (Used in) Financing Activities (1,197) $ (3,082) $ 953  
Finance Lease, Liability, Payments, Remainder of Fiscal Year 8      
Lease Liabilities, Remainder of Year 112      
Lessee, Operating Lease, Liability, Payments, Due Year Two 96      
Finance Lease, Liability, Payments, Due Year Two 8      
Lease Liabilities, Due Year Two 104      
Lessee, Operating Lease, Liability, Payments, Due Year Three 83      
Finance Lease, Liability, Payments, Due Year Three 8      
Lease Liabilities, Due Year Three 91      
Lessee, Operating Lease, Liability, Payments, Due Year Four 77      
Finance Lease, Liability, Payments, Due Year Four 7      
Lease Liabilities, Due Year Four 84      
Lessee, Operating Lease, Liability, Payments, Due Year Five 74      
Finance Lease, Liability, Payments, Due Year Five 4      
Lease Liabilities, Due Year Five 78      
Lessee, Operating Lease, Liability, Payments, Due after Year Five 1,342      
Finance Lease, Liability, Payments, Due after Year Five 5      
Lease Liabilities, Due After Five Years 1,347      
Lessee, Operating Lease, Liability, Payments, Due 1,776      
Finance Lease, Liability, Payment, Due 40      
Lease Liabilities, Due 1,816      
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 815      
Finance Lease, Liability, Undiscounted Excess Amount 5      
Lease Liability, Undiscounted Excess Amount 820      
Operating Lease, Liability 961      
Finance Lease, Liability 35      
Lease, Liabilities $ 996      
Finance Lease, Weighted Average Remaining Lease Term 5 years      
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 28      
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 40      
Operating Leases [Member]        
Net Cash Provided by (Used in) Operating Activities (159)      
Operating Lease, Right-of-Use Asset 935      
Operating Lease, Liability, Current 60      
Accrued and other current liabilities 1      
Operating Lease, Liability, Noncurrent 901      
Finance Leases [Member]        
Accrued and other current liabilities 1      
Property, Plant and Equipment, Net 1      
Finance Lease, Right-of-Use Asset 29      
Current maturities of long-term debt 6      
Long-term debt, less current maturities 26      
Other non-current liabilities 2      
Lease, Cost 7      
Cost of Goods and Service Benchmark [Member]        
Operating Lease, Cost 28      
Operating Expense [Member]        
Operating Lease, Cost 73      
Short-term Lease, Cost 42      
Variable Lease, Cost 17      
Selling, General and Administrative Expenses [Member]        
Operating Lease, Cost 16      
Depreciation And Amortization [Member]        
Finance Lease, Right-of-Use Asset, Amortization 6      
Other Revenue [Member]        
Sublease Income $ 47      
ETO [Member]        
Operating Lease, Weighted Average Discount Rate, Percent 5.00%      
Finance Lease, Weighted Average Discount Rate, Percent 5.00%      
Real Estate [Member]        
Lessee, Operating Lease, Term of Contract 40 years      
Minimum [Member]        
Lessee, Operating Lease, Renewal Term 1 year      
Minimum [Member] | Equipment [Member]        
Lessee, Operating Lease, Term of Contract 5 years      
Maximum [Member]        
Lessee, Operating Lease, Renewal Term 20 years      
Maximum [Member] | Equipment [Member]        
Lessee, Operating Lease, Term of Contract 15 years