Financial Instruments - Summary of Information Regarding Notes Repaid (Detail)
$ in Millions, $ in Millions, £ in Billions |
12 Months Ended |
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Dec. 31, 2020
USD ($)
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Dec. 31, 2021
USD ($)
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Nov. 30, 2021
USD ($)
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Nov. 30, 2021
GBP (£)
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Dec. 31, 2020
CAD ($)
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| Disclosure of detailed information about borrowings [Line Items] |
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| Debt instrument, principal amount |
$ 999
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$ 999
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$ 3,500
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£ 2.6
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| Redemption of notes [member] | 3.95% Notes, Due 2021 [member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Debt instrument, maturity year |
2021
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| Notes, repaid date |
January 2020
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| Debt instrument, interest rate |
3.95%
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3.95%
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| Debt instrument, principal amount |
$ 139
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| Redemption of notes [member] | 2.239% Notes, Due 2025 [member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Debt instrument, interest rate |
2.239%
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2.239%
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| Redemption of notes [member] | 3.309% Notes, Due 2021 [member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Debt instrument, maturity year |
2021
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| Notes, repaid date |
January 2020
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| Debt instrument, interest rate |
3.309%
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3.309%
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| Debt instrument, principal amount |
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$ 550
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| Transaction notes issued [Member] | 2.239% Notes, Due 2025 [member] |
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| Disclosure of detailed information about borrowings [Line Items] |
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| Debt instrument, maturity year |
2025
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| Notes issued for transaction |
May 2020
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| Debt instrument, principal amount |
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$ 1,400
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