Debt Obligations and Commitments - Additional Information (Detail) $ in Millions, R in Billions	Mar. 21, 2020 USD ($)	Mar. 21, 2020 ZAR (R)
Notes Due 2025 [Member] \| Two Point Two Five Percent Notes Due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,500
Debt Instrument, Interest Rate, Stated Percentage	2.25%	2.25%
Notes Due 2027 [Member] \| Two Point Six Two Five Percent Notes Due 2027 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 500
Debt Instrument, Interest Rate, Stated Percentage	2.625%	2.625%
Notes Due 2030 [Member] \| Two Point Seven Five Percent Notes Due 2030 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,500
Debt Instrument, Interest Rate, Stated Percentage	2.75%	2.75%
Notes Due 2040 [Member] \| Three Point Five Percent Notes Due 2040 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 750
Debt Instrument, Interest Rate, Stated Percentage	3.50%	3.50%
Notes Due 2060 [Member] \| Three Point Six Two Five Percent Notes Due 2050 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 1,500
Debt Instrument, Interest Rate, Stated Percentage	3.625%	3.625%
Notes Due 2060 [Member] \| Three Point Eight Seven Five Percent Notes Due 2060 [Member]
Debt Instrument [Line Items]
Debt Instrument, Face Amount	$ 750
Debt Instrument, Interest Rate, Stated Percentage	3.875%	3.875%
Pioneer Bridge Loan Facilities [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding	$ 1,300	R 21.7
Debt Instrument, Interest Rate, Stated Percentage	7.50%	7.50%

Face (par) amount of debt instrument at time of issuance.

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Fair value of the amount outstanding under the credit facility.

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