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Long-term Debt - Additional Information (Detail) € in Millions, $ in Millions	1 Months Ended		3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2019 USD ($)	Apr. 24, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2019 EUR (€)
Debt Instrument [Line Items]
Debt instrument premium paid		$ 48
Debt instrument premium paid on repurchase	$ 29
Long-term debt, fair value	16,900		$ 16,900	$ 16,900	$ 14,600
Committed credit facility agreement aggregated	6,500		6,500	6,500
Unused credit facility	4,100		4,100	4,100
Short-term borrowings and current portion of long-term debt	340		340	340	1,407
Long-term Debt	16,333		16,333	16,333	14,644
Commercial paper programs mature in February 2020
Debt Instrument [Line Items]
Committed credit facility agreement aggregated	1,000		1,000	1,000
Commercial paper programs mature in February 2023
Debt Instrument [Line Items]
Committed credit facility agreement aggregated	2,000		2,000	2,000
Commercial paper programs mature in February 2024
Debt Instrument [Line Items]
Committed credit facility agreement aggregated	2,000		2,000	2,000
Commercial paper programs mature in July 2024
Debt Instrument [Line Items]
Committed credit facility agreement aggregated	1,500		1,500	1,500
Commercial paper borrowings
Debt Instrument [Line Items]
Long-term debt	2,400		2,400	2,400	2,400
Short-term borrowings and current portion of long-term debt	300		300	300
Long-term Debt	$ 2,128		$ 2,128	$ 2,128	$ 2,433
3.90% Senior Notes due 2028
Debt Instrument [Line Items]
Notes, face amount		$ 1,500
Debt instrument interest rate	3.90%	3.90%	3.90%	3.90%	3.90%	3.90%
Debt instrument maturity date		2028		2028	2028
Long-term Debt	$ 1,442		$ 1,442	$ 1,442
3.00% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument, amount exchanged		$ 401
Debt instrument interest rate		3.00%
Debt instrument maturity date		2020
Long-term Debt	$ 415		$ 415	$ 415	$ 1,596
3.63% Senior Notes due 2022
Debt Instrument [Line Items]
Debt instrument, amount exchanged		$ 234
Debt instrument interest rate		3.63%
Debt instrument maturity date		2022
4.00% Senior Notes due 2025
Debt Instrument [Line Items]
Debt instrument, amount exchanged		$ 817
Debt instrument interest rate	4.00%	4.00%	4.00%	4.00%	4.00%	4.00%
Debt instrument maturity date		2025		2025	2025
0.00% Notes due 2024
Debt Instrument [Line Items]
Notes, face amount | €						€ 500
Debt instrument interest rate	0.00%		0.00%	0.00%	0.00%	0.00%
Debt instrument maturity date			2024	2024	2024
Long-term Debt	$ 544		$ 544	$ 544
0.25% Notes due 2027
Debt Instrument [Line Items]
Notes, face amount | €						€ 500
Debt instrument interest rate	0.25%		0.25%	0.25%	0.25%	0.25%
Debt instrument maturity date			2027	2027	2027
Long-term Debt	$ 543		$ 543	$ 543
0.50% Notes due 2031
Debt Instrument [Line Items]
Notes, face amount | €						€ 500
Debt instrument interest rate	0.50%		0.50%	0.50%	0.50%	0.50%
Debt instrument maturity date			2031	2031	2031
Long-term Debt	$ 536		$ 536	$ 536
3.00% Senior Notes due 2020
Debt Instrument [Line Items]
Debt instrument interest rate	3.00%		3.00%	3.00%	3.00%	3.00%
Debt instrument maturity date	2020			2020	2020
Debt instrument, repurchase amount	$ 783		$ 783	$ 783
3.625% Senior Notes due 2022
Debt Instrument [Line Items]
Debt instrument interest rate	3.625%		3.625%	3.625%		3.625%
Debt instrument maturity date	2022
Debt instrument, repurchase amount	$ 321		$ 321	$ 321

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