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Debt - Long-term And Short-term Debt (Details)	1 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2020 USD ($)	May 31, 2020 EUR (€)
Debt Disclosure [Abstract]
Commercial paper and U.S. bank borrowings	$ 3,230,000,000		$ 3,230,000,000		$ 996,000,000
Other bank borrowings (primarily international)	794,000,000		794,000,000		736,000,000
Total short-term debt	4,024,000,000		4,024,000,000		1,732,000,000
Debt Instrument [Line Items]
Carrying value	13,779,000,000		13,779,000,000		12,224,000,000
Obligations under finance leases	150,000,000		150,000,000
Obligations under finance leases					149,000,000
Long-term debt including current maturities	13,779,000,000		13,779,000,000		12,224,000,000
Less: current portion of long-term debt	(1,820,000,000)		(1,820,000,000)		(1,531,000,000)
Total long-term debt	11,959,000,000		11,959,000,000		10,693,000,000
Total debt	17,803,000,000		17,803,000,000		13,956,000,000
Repayments of long-term debt	$ 300,000,000	€ 1,000,000,000	$ 1,582,000,000	$ 1,568,000,000
2.25% Notes due 2020 (e)
Debt Instrument [Line Items]
Carrying value					$ 300,000,000
Interest rate	2.25%		2.25%		2.25%
1.75% Euro denominated notes due 2020
Debt Instrument [Line Items]
Carrying value	$ 0		$ 0		$ 1,137,000,000
Interest rate	1.75%		1.75%		1.75%
0.634% Euro denominated notes due 2020
Debt Instrument [Line Items]
Carrying value	$ 59,000,000		$ 59,000,000		$ 56,000,000
Interest rate	0.634%		0.634%
4.05% Notes due 2021
Debt Instrument [Line Items]
Carrying value	$ 500,000,000		$ 500,000,000		499,000,000
Interest rate	4.05%		4.05%
3.875% Euro denominated notes due 2021
Debt Instrument [Line Items]
Carrying value	$ 723,000,000		$ 723,000,000		711,000,000
Interest rate	3.875%		3.875%
3.00% Notes due 2021
Debt Instrument [Line Items]
Carrying value	$ 499,000,000		$ 499,000,000		499,000,000
Face amount	$ 500,000,000		$ 500,000,000
Interest rate	3.00%		3.00%
0.250% Euro denominated notes due 2022
Debt Instrument [Line Items]
Carrying value	$ 1,178,000,000		$ 1,178,000,000		1,129,000,000
Interest rate	0.25%		0.25%
2.45% Notes due 2022
Debt Instrument [Line Items]
Carrying value	$ 599,000,000		$ 599,000,000		599,000,000
Interest rate	2.45%		2.45%
2.20% Notes due 2022
Debt Instrument [Line Items]
Carrying value	$ 499,000,000		$ 499,000,000		499,000,000
Face amount					$ 500,000,000
Interest rate	2.20%		2.20%		2.20%
2.70% Notes due 2023
Debt Instrument [Line Items]
Carrying value	$ 499,000,000		$ 499,000,000		$ 499,000,000
Interest rate	2.70%		2.70%
2.00% Euro denominated notes due 2023
Debt Instrument [Line Items]
Carrying value	$ 802,000,000		$ 802,000,000		776,000,000
Interest rate	2.00%		2.00%
5.875% GBP denominated notes due 2023
Debt Instrument [Line Items]
Carrying value	$ 437,000,000		$ 437,000,000		456,000,000
Interest rate	5.875%		5.875%
1.20% Euro denominated notes due 2024
Debt Instrument [Line Items]
Carrying value	$ 643,000,000		$ 643,000,000		615,000,000
Interest rate	1.20%		1.20%
1.875% Euro denominated notes due 2024
Debt Instrument [Line Items]
Carrying value	$ 375,000,000		$ 375,000,000		361,000,000
Interest rate	1.875%		1.875%
2.65% Notes due 2025
Debt Instrument [Line Items]
Carrying value	$ 398,000,000		$ 398,000,000		398,000,000
Interest rate	2.65%		2.65%
1.625% Euro denominated notes due 2025
Debt Instrument [Line Items]
Carrying value	$ 582,000,000		$ 582,000,000		556,000,000
Interest rate	1.625%		1.625%
3.20% Notes due 2026
Debt Instrument [Line Items]
Carrying value	$ 725,000,000		$ 725,000,000		725,000,000
Interest rate	3.20%		3.20%
3.434% Notes due 2026
Debt Instrument [Line Items]
Carrying value	$ 196,000,000		$ 196,000,000		196,000,000
Interest rate	3.434%		3.434%
1.652% Euro denominated notes due 2027
Debt Instrument [Line Items]
Carrying value	$ 97,000,000		$ 97,000,000		93,000,000
Interest rate	1.652%		1.652%
0.250% Euro denominated notes due 2027
Debt Instrument [Line Items]
Carrying value	$ 877,000,000		$ 877,000,000
Face amount | €							€ 750,000,000
Interest rate	0.25%		0.25%				0.25%
1.00% Euro denominated notes due 2028
Debt Instrument [Line Items]
Carrying value	$ 927,000,000		$ 927,000,000		872,000,000
Interest rate	1.00%		1.00%
1.10% Notes due 2030
Debt Instrument [Line Items]
Carrying value	$ 695,000,000		$ 695,000,000		0
Face amount						$ 700,000,000
Interest rate	1.10%		1.10%			1.10%
1.90% Euro denominated notes due 2030
Debt Instrument [Line Items]
Carrying value	$ 122,000,000		$ 122,000,000		118,000,000
Interest rate	1.90%		1.90%
0.550% Euro denominated notes due 2032
Debt Instrument [Line Items]
Carrying value	$ 872,000,000		$ 872,000,000		0
Face amount | €							€ 750,000,000
Interest rate	0.55%		0.55%				0.55%
3.55% Notes due 2042
Debt Instrument [Line Items]
Carrying value	$ 664,000,000		$ 664,000,000		662,000,000
Interest rate	3.55%		3.55%
2.00% Notes due 2050
Debt Instrument [Line Items]
Carrying value	$ 296,000,000		$ 296,000,000		0
Face amount						$ 300,000,000
Interest rate	2.00%		2.00%			2.00%
Other
Debt Instrument [Line Items]
Carrying value	$ 10,000,000		$ 10,000,000		10,000,000
International bank borrowings
Debt Instrument [Line Items]
Carrying value	$ 355,000,000		355,000,000		309,000,000
Derivatives Designated as Hedging Instruments: | Fair Value Hedging | Interest Rate Swap
Debt Instrument [Line Items]
Fair value decrease in debt related to hedge accounting			$ 22,000,000		$ 38,000,000

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