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Financial Instruments and Fair Value Measurements - Foreign Currency Contracts Activity (Detail) | 3 Months Ended
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Mar. 31, 2021 USD ($) Derivative | Mar. 31, 2020 USD ($) Derivative
Derivative [Line Items] |  |
Notional amounts at March 31 |  | $ 750,000,000.0
Forwards [Member] | Net Investment Hedges [Member] | Designated As Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 512,000,000 | 484,000,000
New contracts | 550,000,000 | 324,000,000
Matured, expired or settled contracts | (63,000,000) | (576,000,000)
Notional amounts at March 31 | 999,000,000 | 232,000,000
Forwards [Member] | CAD | Net Investment Hedges [Member] | Designated As Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | 377,000,000 | 97,000,000
New contracts | 250,000,000 | 0
Matured, expired or settled contracts | (63,000,000) | 0
Notional amounts at March 31 | $ 564,000,000 | $ 97,000,000
Weighted average forward rate at March 31 | 1.29 | 1.32
Active contracts at March 31 | Derivative | 7 | 2
Forwards [Member] | GBP | Net Investment Hedges [Member] | Designated As Hedging Instrument [Member] |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 135,000,000 | $ 387,000,000
New contracts | 300,000,000 | 324,000,000
Matured, expired or settled contracts | 0 | (576,000,000)
Notional amounts at March 31 | $ 435,000,000 | $ 135,000,000
Weighted average forward rate at March 31 | 1.38 | 1.35
Active contracts at March 31 | Derivative | 4 | 1

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