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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      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves, Balance at beginning of period $ 34 $ 33 $ 18
Valuation Allowances and Reserves, Charged to Cost and Expense 9 23 22
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction (7) (24) (6)
Valuation Allowances and Reserves, Other Activity 2 2 (1)
Valuation Allowances and Reserves, Balance at end of period 38 34 33
Tax valuation allowance      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Valuation Allowances and Reserves, Balance at beginning of period 1,008 1,399 706
Valuation Allowances and Reserves, Charged to Cost and Expense [1] 292 0 706
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction (120) (406) 0
Valuation Allowances and Reserves, Other Activity (2) 15 (13)
Valuation Allowances and Reserves, Balance at end of period $ 1,178 $ 1,008 $ 1,399
[1] Additions Charged to Costs and Expenses are primarily related to taxable losses for which the tax benefit has been reserved.