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Lease Accounting Leasee Accounting (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Rental Income, Nonoperating $ 144 $ 149  
Operating Lease, Weighted Average Remaining Lease Term 22 years 24 years  
Operating Lease, Cost $ 106 $ 117  
Operating Lease, Right-of-Use Asset 1,000 964  
Operating Lease, Liability, Current 53 60  
Accrued and other current liabilities 2,775 3,342  
Operating Lease, Liability, Noncurrent 837 901  
Property, Plant and Equipment, Net 75,107 74,193  
Current maturities of long-term debt 21 26  
Long-term debt, less current maturities 51,417 51,028  
Other non-current liabilities 1,152 1,162  
Finance Lease, Interest Expense 1 1  
Lease, Cost 109 136  
Lease, Cost, Gross 157 183  
Net Cash Provided by (Used in) Financing Activities (2,387) $ (1,250) $ (3,082)
Lessee, Operating Lease, Liability, Payments, Due Year Two 85    
Finance Lease, Liability, Payments, Due Year Two 2    
Lease Liabilities, Due Year Two 87    
Lessee, Operating Lease, Liability, Payments, Due Year Three 79    
Finance Lease, Liability, Payments, Due Year Three 2    
Lease Liabilities, Due Year Three 81    
Lessee, Operating Lease, Liability, Payments, Due Year Four 76    
Finance Lease, Liability, Payments, Due Year Four 1    
Lease Liabilities, Due Year Four 77    
Lessee, Operating Lease, Liability, Payments, Due Year Five 75    
Finance Lease, Liability, Payments, Due Year Five 1    
Lease Liabilities, Due Year Five 76    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 1,140    
Finance Lease, Liability, Payments, Due after Year Five 4    
Lease Liabilities, Due After Five Years 1,144    
Lessee, Operating Lease, Liability, Payments, Due 1,554    
Finance Lease, Liability, Payment, Due 12    
Lease Liabilities, Due 1,566    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 664    
Finance Lease, Liability, Undiscounted Excess Amount 3    
Lease Liability, Undiscounted Excess Amount 667    
Operating Lease, Liability 890    
Finance Lease, Liability 9    
Lease, Liabilities $ 899    
Finance Lease, Weighted Average Remaining Lease Term 9 years 5 years  
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability $ 0 $ 28  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 42 40  
Lease Liabilities, Due Year One 101    
Finance Lease, Liability, to be Paid, Year One 2    
Lessee, Operating Lease, Liability, to be Paid, Year One 99    
Operating Leases [Member]      
Net Cash Provided by (Used in) Operating Activities (117) (159)  
Operating Lease, Right-of-Use Asset 863 935  
Operating Lease, Liability, Current 53 60  
Accrued and other current liabilities 1 1  
Operating Lease, Liability, Noncurrent 837 901  
Finance Leases [Member]      
Accrued and other current liabilities 1 1  
Property, Plant and Equipment, Net 1 1  
Finance Lease, Right-of-Use Asset 3 29  
Current maturities of long-term debt 1 6  
Long-term debt, less current maturities 6 26  
Other non-current liabilities 1 2  
Lease, Cost 4 7  
Cost of Goods and Service Benchmark [Member]      
Operating Lease, Cost 14 28  
Operating Expense [Member]      
Operating Lease, Cost 75 73  
Short-term Lease, Cost 31 42  
Variable Lease, Cost 16 17  
Selling, General and Administrative Expenses [Member]      
Operating Lease, Cost 17 16  
Depreciation And Amortization [Member]      
Finance Lease, Right-of-Use Asset, Amortization 3 6  
Other Revenue [Member]      
Sublease Income $ 48 $ 47  
ETO [Member]      
Operating Lease, Weighted Average Discount Rate, Percent 5.00% 5.00%  
Finance Lease, Weighted Average Discount Rate, Percent 8.00% 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