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Financial Instruments - Balance Sheet (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | $ (5) | $ (14)
Gain (loss) expected to be reclassified in one year or less | (1) |
Foreign currency |  |
Derivatives, Fair Value [Line Items] |  |
Accumulated other comprehensive income (loss), cumulative changes in net gain (loss) from hedges, before tax | (1) | 0
Gain (loss) expected to be reclassified in one year or less | (1) |
Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 2 | 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 | 4 | 2
Not Designated as Hedging Instrument [Member] | Foreign currency | Prepaid Expenses and Other Current Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 1 | 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 | 0 | 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 | 17 | 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 | (25) | (30)
Gain (loss) expected to be reclassified in one year or less | 0 |
Net investment hedge | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative assets | 17 | 12
Net investment hedge | Designated as Hedging Instrument [Member] | Other Noncurrent Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability, Fair Value, Gross Liability | $ 0 | $ 0

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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994 + Details
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