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Financial Instruments and Fair Value Measurements - Summary of Undesignated Foreign Currency Forwards 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] | Undesignated Derivatives [Member] |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 1,162,000,000 | 1,107,000,000
New contracts | 127,000,000 | 1,191,000,000
Matured, expired or settled contracts | (91,000,000) | (1,322,000,000)
Notional amounts at March 31 | 1,198,000,000 | $ 976,000,000
Weighted average forward rate at March 31 |  | 0
Active contracts at March 31 | Derivative |  | 0
Forwards [Member] | Undesignated Derivatives [Member] | CAD |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | 163,000,000 | $ 120,000,000
New contracts | 3,000,000 | 0
Matured, expired or settled contracts | (11,000,000) | (11,000,000)
Notional amounts at March 31 | $ 155,000,000 | $ 109,000,000
Weighted average forward rate at March 31 | 1.32 | 1.32
Active contracts at March 31 | Derivative | 58 | 35
Forwards [Member] | Undesignated Derivatives [Member] | EUR |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 474,000,000 | $ 581,000,000
New contracts | 83,000,000 | 809,000,000
Matured, expired or settled contracts | (36,000,000) | (1,003,000,000)
Notional amounts at March 31 | $ 521,000,000 | $ 387,000,000
Weighted average forward rate at March 31 | 1.23 | 1.16
Active contracts at March 31 | Derivative | 74 | 61
Forwards [Member] | Undesignated Derivatives [Member] | GBP |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 207,000,000 | $ 178,000,000
New contracts | 11,000,000 | 294,000,000
Matured, expired or settled contracts | (16,000,000) | (267,000,000)
Notional amounts at March 31 | $ 202,000,000 | $ 205,000,000
Weighted average forward rate at March 31 | 1.33 | 1.77
Active contracts at March 31 | Derivative | 53 | 64
Forwards [Member] | Undesignated Derivatives [Member] | JPY |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 252,000,000 | $ 182,000,000
New contracts | 25,000,000 | 60,000,000
Matured, expired or settled contracts | (20,000,000) | (15,000,000)
Notional amounts at March 31 | $ 257,000,000 | $ 227,000,000
Weighted average forward rate at March 31 | 102.66 | 103.08
Active contracts at March 31 | Derivative | 68 | 53
Forwards [Member] | Undesignated Derivatives [Member] | SEK |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 38,000,000 | $ 31,000,000
New contracts | 5,000,000 | 9,000,000
Matured, expired or settled contracts | (4,000,000) | (3,000,000)
Notional amounts at March 31 | $ 39,000,000 | $ 37,000,000
Weighted average forward rate at March 31 | 8.59 | 9.41
Active contracts at March 31 | Derivative | 51 | 32
Forwards [Member] | Undesignated Derivatives [Member] | Other |  |
Derivative [Line Items] |  |
Notional amounts at January 1 | $ 28,000,000 | $ 15,000,000
New contracts | 0 | 19,000,000
Matured, expired or settled contracts | (4,000,000) | (23,000,000)
Notional amounts at March 31 | $ 24,000,000 | $ 11,000,000
Weighted average forward rate at March 31 |  | 0
Active contracts at March 31 | Derivative |  | 0

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