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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.

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