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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts      
Valuation and qualifying accounts      
Balance at Beginning of Period $ 594 $ 558 $ 20
Charged to Costs and Expenses 77 37 543
Charged to Other Accounts (3) (2) (3)
Deductions 0 1 (2)
Balance at End of Period 668 594 558
Valuation allowance and reserves, current 24 18 17
Environmental, litigation, tax and other reserves      
Valuation and qualifying accounts      
Balance at Beginning of Period 935 997 479
Charged to Costs and Expenses 140 45 61
Charged to Other Accounts 85 53 531
Deductions (166) (160) (74)
Balance at End of Period 994 935 997
Valuation allowance and reserves, current $ 146 $ 163 $ 197