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Lease Accounting Leasee Accounting (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 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) $ 85      
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES 1,815 $ 2,139    
Net Cash Provided by (Used in) Financing Activities (607) (2,967)    
Operating Lease, Cost 28      
Lease assets obtained in exchange for new lease liabilities 8 $ 0    
Finance Lease, Liability, 2019 (remainder) 2      
Lease Liabilities, 2019 (remainder) 87      
Lessee, Operating Lease, 2020 96      
Finance Lease, Liability, 2020 2      
Lease Liabilities, 2020 98      
Lessee, Operating Lease, 2021 84      
Finance Lease, Liability, 2021 2      
Lease Liabilities, 2021 86      
Lessee, Operating Lease, 2022 71      
Finance Lease, Liability, 2022 1      
Lease Liabilities, 2022 72      
Lessee, Operating Lease, 2023 67      
Finance Lease, Liability, 2023 1      
Lease Liabilities, 2023 68      
Lessee, Operating Lease, Thereafter 1,148      
Thereafter 5      
Finance Lease, Liability, Thereafter 7      
Lease Liabilities, Thereafter 1,155      
Lessee, Operating Lease, Liability, Payments, Due 1,551      
Finance Lease, Liability, Payments, Due 15      
Lease Liabilities, Due 1,566      
Lessee, Operating Lease, Liability, Undiscounted Excess Amount (665)      
Finance Lease, Liability, Undiscounted Excess Amount (5)      
Lease Liability, Undiscounted Excess Amount 670      
Operating Lease, Liability 886   888  
Finance Lease, Liability 10      
Lease, Liabilities 896      
Lease, Cost, Gross 43      
Lease, Cost 32      
Operating lease current liabilities 68   71 $ 0
Accrued and other current liabilities 2,367   2,917 2,918
Non-current operating lease liabilities 817   823 0
Property, plant and equipment, net 67,317   66,962 66,963
Current maturities of long-term debt 157   2,656 2,655
Long-term debt, less current maturities 46,373   43,379 43,373
Other non-current liabilities $ 1,154   $ 1,172 $ 1,184
Minimum [Member]        
Lessee, Lease, Description [Line Items]        
Lessee, Operating Lease, Renewal Term 1 year      
Maximum [Member]        
Lessee, Lease, Description [Line Items]        
Lessee, Operating Lease, Renewal Term 20 years      
Equipment [Member] | Minimum [Member]        
Lessee, Lease, Description [Line Items]        
Lessee, Operating Lease, Term of Contract 5 years      
Equipment [Member] | Maximum [Member]        
Lessee, Lease, Description [Line Items]        
Lessee, Operating Lease, Term of Contract 15 years      
Real Estate [Member]        
Lessee, Lease, Description [Line Items]        
Lessee, Operating Lease, Term of Contract 40 years      
Operating Leases [Member]        
Lessee, Lease, Description [Line Items]        
Lease right-of-use assets, net $ 868      
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES (34)      
Operating lease current liabilities 68      
Accrued and other current liabilities 1      
Non-current operating lease liabilities 817      
Finance Leases [Member]        
Lessee, Lease, Description [Line Items]        
Accrued and other current liabilities 1      
Property, plant and equipment, net 2      
Finance Lease, Right-of-Use Asset 4      
Long-term debt, less current maturities 7      
Other non-current liabilities $ 2      
ETO [Member]        
Lessee, Lease, Description [Line Items]        
Operating Lease, Weighted Average Discount Rate, Percent 5.00%      
Operating Lease, Weighted Average Remaining Lease Term 21 years      
Finance Lease, Weighted Average Remaining Lease Term 10 years      
Finance Lease, Weighted Average Discount Rate, Percent 8.00%      
Cost of Goods, Total [Member]        
Lessee, Lease, Description [Line Items]        
Operating Lease, Cost $ 8      
Depreciation And Amortization [Member]        
Lessee, Lease, Description [Line Items]        
Finance Lease, Right-of-Use Asset, Amortization 1      
Operating Expense [Member]        
Lessee, Lease, Description [Line Items]        
Operating Lease, Cost 17      
Short-term Lease, Cost 11      
Variable Lease, Cost 3      
Selling, General and Administrative Expenses [Member]        
Lessee, Lease, Description [Line Items]        
Operating Lease, Cost 3      
Other Revenue [Member]        
Lessee, Lease, Description [Line Items]        
Sublease Income $ 11