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Lease Accounting Leasee Accounting (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Jan. 01, 2019
Dec. 31, 2018
Lessee, Lease, Description [Line Items]          
Lease right-of-use assets, net       $ 889  
Lessee, Operating Lease, Liability, 2019 (remainder) $ 27 $ 27      
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability   37      
Net Cash Provided by (Used in) Financing Activities   $ (1,751) $ (3,208)    
Operating Lease, Weighted Average Remaining Lease Term 22 years 22 years      
Finance Lease, Weighted Average Remaining Lease Term 6 years 6 years      
Operating Lease, Cost $ 28 $ 87      
Finance Lease, Interest Expense 1 1      
Lease assets obtained in exchange for new lease liabilities   36      
Finance Lease, Liability, 2019 (remainder) 2 2      
Lease Liabilities, 2019 (remainder) 29 29      
Lessee, Operating Lease, 2020 96 96      
Finance Lease, Liability, 2020 10 10      
Lease Liabilities, 2020 106 106      
Lessee, Operating Lease, 2021 87 87      
Finance Lease, Liability, 2021 10 10      
Lease Liabilities, 2021 97 97      
Lessee, Operating Lease, 2022 75 75      
Finance Lease, Liability, 2022 10 10      
Lease Liabilities, 2022 85 85      
Lessee, Operating Lease, 2023 70 70      
Finance Lease, Liability, 2023 9 9      
Lease Liabilities, 2023 79 79      
Lessee, Operating Lease, Thereafter 1,170 1,170      
Thereafter 7 7      
Finance Lease, Liability, Thereafter 10 10      
Lease Liabilities, Thereafter 1,180 1,180      
Lessee, Operating Lease, Liability, Payments, Due 1,525 1,525      
Finance Lease, Liability, Payment, Due 51 51      
Lease Liabilities, Due 1,576 1,576      
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 660 660      
Finance Lease, Liability, Undiscounted Excess Amount 6 6      
Lease Liability, Undiscounted Excess Amount 666 666      
Operating Lease, Liability 865 865   888  
Finance Lease, Liability 45 45      
Lease, Liabilities 910 910      
Lease, Cost, Gross 44 136      
Lease, Cost 30 99      
Operating lease current liabilities 57 57   71 $ 0
Accrued and other current liabilities 3,234 3,234   2,917 2,918
Non-current operating lease liabilities 807 807   823 0
Property, plant and equipment, net 69,169 69,169   66,962 66,963
Current maturities of long-term debt 14 14   2,656 2,655
Long-term debt, less current maturities 46,840 46,840   43,379 43,373
Other non-current liabilities $ 1,138 $ 1,138   $ 1,172 $ 1,184
Minimum [Member]          
Lessee, Lease, Description [Line Items]          
Lessee, Operating Lease, Renewal Term 1 year 1 year      
Maximum [Member]          
Lessee, Lease, Description [Line Items]          
Lessee, Operating Lease, Renewal Term 20 years 20 years      
Equipment [Member] | Minimum [Member]          
Lessee, Lease, Description [Line Items]          
Lessee, Operating Lease, Term of Contract 5 years 5 years      
Equipment [Member] | Maximum [Member]          
Lessee, Lease, Description [Line Items]          
Lessee, Operating Lease, Term of Contract 15 years 15 years      
Real Estate [Member]          
Lessee, Lease, Description [Line Items]          
Lessee, Operating Lease, Term of Contract 40 years 40 years      
Operating Leases [Member]          
Lessee, Lease, Description [Line Items]          
Lease right-of-use assets, net $ 850 $ 850      
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES   (78)      
Operating lease current liabilities 57 57      
Accrued and other current liabilities 1 1      
Non-current operating lease liabilities 807 807      
Finance Leases [Member]          
Lessee, Lease, Description [Line Items]          
Lease, Cost 3 5      
Accrued and other current liabilities 1 1      
Property, plant and equipment, net 2 2      
Finance Lease, Right-of-Use Asset 39 39      
Current maturities of long-term debt 7 7      
Long-term debt, less current maturities 35 35      
Other non-current liabilities $ 2 $ 2      
ETO [Member]          
Lessee, Lease, Description [Line Items]          
Operating Lease, Weighted Average Discount Rate, Percent 5.00% 5.00%      
Finance Lease, Weighted Average Discount Rate, Percent 5.00% 5.00%      
Cost of Goods and Service Benchmark [Member]          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost $ 7 $ 23      
Depreciation And Amortization [Member]          
Lessee, Lease, Description [Line Items]          
Finance Lease, Right-of-Use Asset, Amortization 2 4      
Operating Expense [Member]          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 18 54      
Short-term Lease, Cost 10 33      
Variable Lease, Cost 3 11      
Selling, General and Administrative Expenses [Member]          
Lessee, Lease, Description [Line Items]          
Operating Lease, Cost 3 10      
Other Revenue [Member]          
Lessee, Lease, Description [Line Items]          
Sublease Income $ 14 $ 37