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Debt - Long-term And Short-term Debt (Details) € in Millions	1 Months Ended	9 Months Ended		12 Months Ended
	Jun. 30, 2021 EUR (€)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2021 EUR (€)
Debt Disclosure [Abstract]
Commercial paper		$ 2,022,000,000		$ 2,527,000,000
Other borrowings (primarily non U.S.)		873,000,000		724,000,000
Total short-term debt		$ 2,895,000,000		3,251,000,000
Debt Instrument [Line Items]
Interest rate		0.375%			0.375%
Carrying Value		$ 13,832,000,000		12,903,000,000
Less: current portion of long-term debt		(2,293,000,000)		(751,000,000)
Total long-term debt		11,539,000,000		12,152,000,000
Total debt		16,727,000,000		16,154,000,000
Repayments of long-term debt	€ 600	$ 821,000,000	$ 1,582,000,000
3.875% Euro denominated notes due 2021
Debt Instrument [Line Items]
Interest rate		3.875%			3.875%
Carrying Value		$ 0		748,000,000
0.250% Euro denominated notes due 2022
Debt Instrument [Line Items]
Interest rate		0.25%			0.25%
Carrying Value		$ 1,160,000,000		1,226,000,000
2.45% Notes due 2022
Debt Instrument [Line Items]
Interest rate		2.45%			2.45%
Carrying Value		$ 600,000,000		$ 599,000,000
2.20% Notes due 2022
Debt Instrument [Line Items]
Interest rate		2.20%		2.20%	2.20%
Carrying Value		$ 500,000,000		$ 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%
Carrying Value		$ 499,000,000		499,000,000
2.00% Euro denominated notes due 2023
Debt Instrument [Line Items]
Interest rate		2.00%			2.00%
Carrying Value		$ 777,000,000		832,000,000
5.875% GBP denominated notes due 2023
Debt Instrument [Line Items]
Interest rate		5.875%			5.875%
Carrying Value		$ 436,000,000		460,000,000
1.20% Euro denominated notes due 2024
Debt Instrument [Line Items]
Interest rate		1.20%			1.20%
Carrying Value		$ 636,000,000		671,000,000
1.875% Euro denominated notes due 2024
Debt Instrument [Line Items]
Interest rate		1.875%			1.875%
Carrying Value		$ 364,000,000		389,000,000
2.65% Notes due 2025
Debt Instrument [Line Items]
Interest rate		2.65%			2.65%
Carrying Value		$ 399,000,000		398,000,000
1.625% Euro denominated notes due 2025
Debt Instrument [Line Items]
Interest rate		1.625%			1.625%
Carrying Value		$ 575,000,000		607,000,000
0.00% Euro denominated notes due 2026
Debt Instrument [Line Items]
Interest rate		0.00%			0.00%
Carrying Value		$ 814,000,000		0
Debt instrument face amount \| €					€ 700
3.20% Notes due 2026
Debt Instrument [Line Items]
Interest rate		3.20%			3.20%
Carrying Value		$ 725,000,000		725,000,000
3.434% Notes due 2026
Debt Instrument [Line Items]
Interest rate		3.434%			3.434%
Carrying Value		$ 197,000,000		196,000,000
1.652% Euro denominated notes due 2027
Debt Instrument [Line Items]
Interest rate		1.652%			1.652%
Carrying Value		$ 95,000,000		100,000,000
0.250% Euro denominated notes due 2027
Debt Instrument [Line Items]
Interest rate		0.25%			0.25%
Carrying Value		$ 867,000,000		914,000,000
1.00% Euro denominated notes due 2028
Debt Instrument [Line Items]
Interest rate		1.00%			1.00%
Carrying Value		$ 902,000,000		966,000,000
1.10% Notes due 2030
Debt Instrument [Line Items]
Interest rate		1.10%			1.10%
Carrying Value		$ 696,000,000		696,000,000
1.90% Euro denominated notes due 2030
Debt Instrument [Line Items]
Interest rate		1.90%			1.90%
Carrying Value		$ 121,000,000		127,000,000
0.550% Euro denominated notes due 2032
Debt Instrument [Line Items]
Interest rate		0.55%			0.55%
Carrying Value		$ 862,000,000		909,000,000
0.375% Euro denominated noted due 2033
Debt Instrument [Line Items]
Interest rate		0.375%			0.375%
Carrying Value		$ 575,000,000
Debt instrument face amount \| €					€ 500
3.55% Notes due 2042
Debt Instrument [Line Items]
Interest rate		3.55%			3.55%
Carrying Value		$ 664,000,000		664,000,000
2.00% Notes due 2050
Debt Instrument [Line Items]
Interest rate		2.00%			2.00%
Carrying Value		$ 296,000,000		296,000,000
1.00% Euro denominated notes due 2051
Debt Instrument [Line Items]
Interest rate		1.00%			1.00%
Carrying Value		$ 803,000,000		0
Debt instrument face amount \| €					€ 700
Non U.S. borrowings
Debt Instrument [Line Items]
Carrying Value		259,000,000		372,000,000
Other
Debt Instrument [Line Items]
Carrying Value		10,000,000		10,000,000
Derivatives Designated as Hedging Instruments: \| Fair Value Hedging \| Interest Rate Swap
Debt Instrument [Line Items]
Fair value decrease in debt related to hedge accounting		$ 52,000,000		$ 79,000,000