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Long-term Debt and Debt Facility Agreements - Long-term Debt (Parenthetical) (Detail)	3 Months Ended					12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Jun. 30, 2017
Debt Instrument [Line Items]
Debt instrument interest rate								6.50%
3.30% Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument interest rate	3.30%				3.30%	3.30%	3.30%
Debt instrument maturity date						2021	2021
3.65% Senior Notes due 2023
Debt Instrument [Line Items]
Debt instrument interest rate	3.65%				3.65%	3.65%	3.65%
Debt instrument maturity date						2023	2023
3.90% Senior Notes due 2028
Debt Instrument [Line Items]
Debt instrument interest rate	3.90%		3.90%		3.90%	3.90%	3.90%
Debt instrument maturity date			2028			2028	2028
2.40% Senior Notes due 2022
Debt Instrument [Line Items]
Debt instrument interest rate	2.40%				2.40%	2.40%	2.40%
Debt instrument maturity date						2022	2022
4.00% Senior Notes due 2025
Debt Instrument [Line Items]
Debt instrument interest rate	4.00%		4.00%		4.00%	4.00%	4.00%
Debt instrument maturity date			2025			2025	2025
4.30% Senior Notes due 2029
Debt Instrument [Line Items]
Debt instrument interest rate	4.30%			4.30%	4.30%	4.30%	4.30%
Debt instrument maturity date				2029		2029	2029
3.75% Senior Notes due 2024
Debt Instrument [Line Items]
Debt instrument interest rate	3.75%			3.75%	3.75%	3.75%	3.75%
Debt instrument maturity date				2024		2024	2024
1.00% Guaranteed Notes due 2026
Debt Instrument [Line Items]
Debt instrument interest rate	1.00%				1.00%	1.00%	1.00%
Debt instrument maturity date					2026	2026	2026
4.20% Senior Notes due 2021
Debt Instrument [Line Items]
Debt instrument interest rate	4.20%				4.20%	4.20%	4.20%
Debt instrument maturity date						2021	2021
2.65% Senior Notes due 2022
Debt Instrument [Line Items]
Debt instrument interest rate	2.65%				2.65%	2.65%	2.65%
Debt instrument maturity date						2022	2022
0.00% Notes due 2024
Debt Instrument [Line Items]
Debt instrument interest rate	0.00%	0.00%			0.00%	0.00%	0.00%
Debt instrument maturity date		2024				2024	2024
0.25% Notes due 2027
Debt Instrument [Line Items]
Debt instrument interest rate	0.25%	0.25%			0.25%	0.25%	0.25%
Debt instrument maturity date		2027				2027	2027
0.50% Notes due 2031
Debt Instrument [Line Items]
Debt instrument interest rate	0.50%	0.50%			0.50%	0.50%	0.50%
Debt instrument maturity date		2031				2031	2031
3.63% Senior Notes due 2022
Debt Instrument [Line Items]
Debt instrument interest rate	3.63%		3.63%		3.63%	3.63%	3.63%
Debt instrument maturity date			2022			2022	2022
7.00% Notes due 2038
Debt Instrument [Line Items]
Debt instrument interest rate	7.00%				7.00%	7.00%	7.00%
Debt instrument maturity date						2038	2038
5.95% Notes due 2041
Debt Instrument [Line Items]
Debt instrument interest rate	5.95%				5.95%	5.95%	5.95%
Debt instrument maturity date						2041	2041
5.13% Notes due 2043
Debt Instrument [Line Items]
Debt instrument interest rate	5.13%				5.13%	5.13%	5.13%
Debt instrument maturity date						2043	2043
4.00% Notes due 2023
Debt Instrument [Line Items]
Debt instrument interest rate	4.00%				4.00%	4.00%	4.00%
Debt instrument maturity date						2023	2023
3.70% Notes due 2024
Debt Instrument [Line Items]
Debt instrument interest rate	3.70%				3.70%	3.70%	3.70%
Debt instrument maturity date						2024	2024
3.00% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument interest rate	3.00%				3.00%	3.00%	3.00%
Debt instrument maturity date						2020	2020
2.20% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument interest rate	2.20%				2.20%	2.20%	2.20%
Debt instrument maturity date						2020	2020
4.50% Notes due 2021
Debt Instrument [Line Items]
Debt instrument interest rate	4.50%				4.50%	4.50%	4.50%
Debt instrument maturity date	2021					2021	2021
3.60% Notes due 2022
Debt Instrument [Line Items]
Debt instrument interest rate	3.60%				3.60%	3.60%	3.60%
Debt instrument maturity date	2022					2022	2022

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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