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Debt - Summary of Outstanding Debt (Details) € in Millions	1 Months Ended			12 Months Ended
	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 EUR (€)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Aug. 31, 2020 USD ($)	May 31, 2020 EUR (€)
Short-term
Commercial paper	$ 2,527,000,000			$ 2,527,000,000	$ 996,000,000
Other borrowings (primarily international)	724,000,000			724,000,000	736,000,000
Total short-term debt	3,251,000,000			3,251,000,000	1,732,000,000
Long-term
Carrying value of long-term debt including current portion	12,903,000,000			12,903,000,000	12,224,000,000
Less: current portion of long-term debt	(751,000,000)			(751,000,000)	(1,531,000,000)
Total long-term debt	12,152,000,000			12,152,000,000	10,693,000,000
Total debt	16,154,000,000			16,154,000,000	13,956,000,000
Repayments of long-term debt				2,681,000,000	$ 1,583,000,000	$ 3,124,000,000
Interest charge	16,000,000
2.25% Notes due 2020
Debt Instrument [Line Items]
Interest rate		2.25%	2.25%		2.25%
Long-term
Carrying value of long-term debt including current portion	0			0	$ 300,000,000
Repayments of long-term debt		$ 300,000,000
1.75% Euro denominated notes due 2020
Debt Instrument [Line Items]
Interest rate		1.75%	1.75%		1.75%
Long-term
Carrying value of long-term debt including current portion	0			0	$ 1,137,000,000
Repayments of long-term debt | €			€ 1,000
0.634% Euro denominated notes due 2020
Debt Instrument [Line Items]
Interest rate					0.634%
Long-term
Carrying value of long-term debt including current portion	$ 0			$ 0	$ 56,000,000
4.05% Notes due 2021
Debt Instrument [Line Items]
Interest rate	4.05%			4.05%	4.05%
Long-term
Carrying value of long-term debt including current portion	$ 0			$ 0	$ 499,000,000
Repayments of long-term debt	$ 500,000,000
3.875% Euro denominated notes due 2021
Debt Instrument [Line Items]
Interest rate	3.875%			3.875%
Long-term
Carrying value of long-term debt including current portion	$ 748,000,000			$ 748,000,000	$ 711,000,000
3.00% Notes due 2021
Debt Instrument [Line Items]
Interest rate	3.00%			3.00%	3.00%
Long-term
Carrying value of long-term debt including current portion	$ 0			$ 0	$ 499,000,000
Repayments of long-term debt	$ 500,000,000			$ 500,000,000
0.250% Euro denominated notes due 2022
Debt Instrument [Line Items]
Interest rate	0.25%			0.25%
Long-term
Carrying value of long-term debt including current portion	$ 1,226,000,000			$ 1,226,000,000	1,129,000,000
2.45% Notes due 2022
Debt Instrument [Line Items]
Interest rate	2.45%			2.45%
Long-term
Carrying value of long-term debt including current portion	$ 599,000,000			$ 599,000,000	599,000,000
2.20% Notes due 2022
Debt Instrument [Line Items]
Interest rate	2.20%			2.20%
Long-term
Carrying value of long-term debt including current portion	$ 499,000,000			$ 499,000,000	499,000,000
Debt instrument, face amount	$ 500,000,000			$ 500,000,000
2.70% Notes due 2023
Debt Instrument [Line Items]
Interest rate	2.70%			2.70%
Long-term
Carrying value of long-term debt including current portion	$ 499,000,000			$ 499,000,000	499,000,000
2.00% Euro denominated notes due 2023
Debt Instrument [Line Items]
Interest rate	2.00%			2.00%
Long-term
Carrying value of long-term debt including current portion	$ 832,000,000			$ 832,000,000	776,000,000
5.875% GBP denominated notes due 2023
Debt Instrument [Line Items]
Interest rate	5.875%			5.875%
Long-term
Carrying value of long-term debt including current portion	$ 460,000,000			$ 460,000,000	456,000,000
1.20% Euro denominated notes due 2024
Debt Instrument [Line Items]
Interest rate	1.20%			1.20%
Long-term
Carrying value of long-term debt including current portion	$ 671,000,000			$ 671,000,000	615,000,000
1.875% Euro denominated notes due 2024
Debt Instrument [Line Items]
Interest rate	1.875%			1.875%
Long-term
Carrying value of long-term debt including current portion	$ 389,000,000			$ 389,000,000	361,000,000
2.65% Notes due 2025
Debt Instrument [Line Items]
Interest rate	2.65%			2.65%
Long-term
Carrying value of long-term debt including current portion	$ 398,000,000			$ 398,000,000	398,000,000
1.625% Euro denominated notes due 2025
Debt Instrument [Line Items]
Interest rate	1.625%			1.625%
Long-term
Carrying value of long-term debt including current portion	$ 607,000,000			$ 607,000,000	556,000,000
3.20% Notes due 2026
Debt Instrument [Line Items]
Interest rate	3.20%			3.20%
Long-term
Carrying value of long-term debt including current portion	$ 725,000,000			$ 725,000,000	725,000,000
3.434% Notes due 2026
Debt Instrument [Line Items]
Interest rate	3.434%			3.434%
Long-term
Carrying value of long-term debt including current portion	$ 196,000,000			$ 196,000,000	196,000,000
1.652% Euro denominated notes due 2027
Debt Instrument [Line Items]
Interest rate	1.652%			1.652%
Long-term
Carrying value of long-term debt including current portion	$ 100,000,000			$ 100,000,000	93,000,000
0.250% Euro denominated notes due 2027
Debt Instrument [Line Items]
Interest rate	0.25%			0.25%				0.25%
Long-term
Carrying value of long-term debt including current portion	$ 914,000,000			$ 914,000,000
Debt instrument, face amount | €								€ 750
1.00% Euro denominated notes due 2028
Debt Instrument [Line Items]
Interest rate	1.00%			1.00%
Long-term
Carrying value of long-term debt including current portion	$ 966,000,000			$ 966,000,000	872,000,000
1.10% Notes due 2030
Debt Instrument [Line Items]
Interest rate	1.10%			1.10%			1.10%
Long-term
Carrying value of long-term debt including current portion	$ 696,000,000			$ 696,000,000	0
Debt instrument, face amount							$ 700,000,000
1.90% Euro denominated notes due 2030
Debt Instrument [Line Items]
Interest rate	1.90%			1.90%
Long-term
Carrying value of long-term debt including current portion	$ 127,000,000			$ 127,000,000	118,000,000
0.550% Euro denominated notes due 2032
Debt Instrument [Line Items]
Interest rate	0.55%			0.55%				0.55%
Long-term
Carrying value of long-term debt including current portion	$ 909,000,000			$ 909,000,000	0
Debt instrument, face amount | €								€ 750
3.55% Notes due 2042
Debt Instrument [Line Items]
Interest rate	3.55%			3.55%
Long-term
Carrying value of long-term debt including current portion	$ 664,000,000			$ 664,000,000	662,000,000
2.00% Notes due 2050
Debt Instrument [Line Items]
Interest rate	2.00%			2.00%			2.00%
Long-term
Carrying value of long-term debt including current portion	$ 296,000,000			$ 296,000,000	0
Debt instrument, face amount							$ 300,000,000
International borrowings
Long-term
Carrying value of long-term debt including current portion	372,000,000			372,000,000	309,000,000
Other
Long-term
Carrying value of long-term debt including current portion	$ 10,000,000			10,000,000	159,000,000
Derivatives Designated as Hedging Instruments - Fair Value | Interest rate swaps | Derivatives Designated as Hedging Instruments:
Long-term
Adjustment to carrying value				$ 79,000,000	$ 38,000,000

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