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Financial Instruments and Fair Value Measurements - Foreign Currency Contracts Activity (Detail) - Forwards [Member] - Net Investment Hedges [Member] - Designated As Hedging Instrument [Member] | 3 Months Ended
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Mar. 31, 2019 USD ($) Derivative | Mar. 31, 2018 USD ($) Derivative
BRL |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 460,000,000 |
New contracts | 489,000,000 |
Matured, expired or settled contracts | (949,000,000) |
Notional amounts at March 31 | $ 0 |
Weighted average forward rate at March 31 | 0 |
Active contracts at March 31 | Derivative | 0 |
GBP |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 127,000,000 |
New contracts | 262,000,000 |
Matured, expired or settled contracts | 0 |
Notional amounts at March 31 | $ 389,000,000 |
Weighted average forward rate at March 31 | 1.30 |
Active contracts at March 31 | Derivative | 6 |
CAD |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 100,000,000 | $ 99,000,000
New contracts | 0 | 100,000,000
Matured, expired or settled contracts | 0 | (99,000,000)
Notional amounts at March 31 | $ 100,000,000 | $ 100,000,000
Weighted average forward rate at March 31 | 1.28 | 1.28
Active contracts at March 31 | Derivative | 2 | 2

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