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Basis of Presentation and Significant Accounting Policies - Foreign Currency Translation and Transactions (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total foreign currency loss (gain) | $ 3 | $ 58 | $ (40)
Unrealized foreign currency option and forward contracts (gains) losses |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total foreign currency loss (gain) | (20) | 49 | (40)
Realized foreign currency option and forward contracts losses (gains) |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total foreign currency loss (gain) | 16 | 15 | (3)
Foreign currency transaction and remeasurement losses (gains) |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Total foreign currency loss (gain) | $ 7 | $ (6) | $ 3

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- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30700-110894 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 + Details
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