Debt Facilities - Optional Redemption Schedule (Detail) - Senior Notes	12 Months Ended
	Dec. 31, 2020	Oct. 23, 2020	Oct. 07, 2020	Jun. 22, 2020
Debt instrument redemption period prior to January 1, 2018
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
Redemption, period	90 days
Debt instrument redemption period prior to January 1, 2018 | Redemption by Company of up to 35% of Aggregate Principal
Debt Instrument, Redemption [Line Items]
Percentage of aggregate principal amount for redemption	35.00%
Senior notes indenture outstanding	65.00%
First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption, period	12 months
First Scheduled Redemption Price | Minimum
Debt Instrument, Redemption [Line Items]
Redemption, period	12 months
First Scheduled Redemption Price | Maximum
Debt Instrument, Redemption [Line Items]
Redemption, period	18 months
5.00% Infomart Senior Notes
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	5.00%
1.250 % Senior Notes Due 2025
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	1.25%			1.25%
1.000% Senior Notes Due 2025
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	1.00%		1.00%
2.875% Euro Senior Notes due 2026
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	2.875%	2.875%
2.875% Euro Senior Notes due 2026 | Early Equity Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	102.875%
2.875% Euro Senior Notes due 2026 | First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	101.438%
2.875% Euro Senior Notes due 2026 | Second Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.719%
2.875% Euro Senior Notes due 2026 | Third Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
5.375% Senior Notes due 2027
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	5.375%
5.375% Senior Notes due 2027 | Early Equity Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	105.375%
5.375% Senior Notes due 2027 | First Scheduled Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	102.688%
5.375% Senior Notes due 2027 | Second Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	101.792%
5.375% Senior Notes due 2027 | Third Year Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.896%
5.375% Senior Notes due 2027 | Fourth Year (if scheduled) Redemption Price
Debt Instrument, Redemption [Line Items]
Redemption price, percentage	100.00%
1.550% Senior Notes Due 2028
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	1.55%		1.55%
1.800% Senior Notes Due 2027
Debt Instrument, Redemption [Line Items]
Interest rate (percent)				1.80%
2.150% Senior Notes Due 2030
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	2.15%			2.15%
3.000% Senior Notes Due 2050
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	3.00%			3.00%
2.950% Senior Notes Due 2051
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	2.95%		2.95%
2.625% Senior Notes due 2024
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	2.625%
2.900% Senior Notes due 2026
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	2.90%
3.200% Senior Notes Due In 2029
Debt Instrument, Redemption [Line Items]
Interest rate (percent)	3.20%