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Financial Instruments and Fair Value Measurements - Summary of Undesignated Financial Instruments Exercised and Realized and Unrealized Gains (Losses) in Foreign Currency and Derivative Gains (Losses) Net (Detail) $ in Millions | 3 Months Ended
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Mar. 31, 2019 USD ($) Contract | Mar. 31, 2018 USD ($) Contract
Derivative Instruments And Hedging Activities Disclosure [Abstract] |  |
Exercised contracts | Contract | 23 | 15
Realized gains (losses) on the matured, expired or settled contracts | $ 1 | $ (7)
Unrealized gains (losses) on the change in fair value of outstanding contracts | $ 7 | $ (13)

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- Definition Amount before tax of foreign currency transaction on mark to market derivatives unrealized gain (loss) recognized in the income statement. + References No definition available. + Details
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- Definition Amount before tax of foreign currency transaction realized 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 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109240200&loc=d3e30690-110894 Reference 2: 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 3: 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 + Details
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