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Financial Instruments - Balance Sheet (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | $ 7 | $ (14)
Gain (loss) expected to be reclassified in one year or less | 0 |
Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 3 | 2
Designated as Hedging Instrument [Member] | Foreign currency | Accounts Payable and Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 3 | 2
Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 21 | 12
Designated as Hedging Instrument [Member] | Cross Currency Interest Rate Contract [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 0 | 0
Not Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 0 | 1
Not Designated as Hedging Instrument [Member] | Foreign currency | Accounts Payable and Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | 1 | 0
Net investment hedge | Foreign currency |  |
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | 4 | 4
Gain (loss) expected to be reclassified in one year or less | 0 |
Net investment hedge | Cross Currency Interest Rate Contract [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | 21 | 12
Gain (loss) expected to be reclassified in one year or less | 0 |
Net investment hedge | Foreign currency denominated debt designated as a net investment hedge [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | (18) | $ (30)
Gain (loss) expected to be reclassified in one year or less | $ 0 |

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