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Debt - Long-term And Short-term Debt (Details) € in Millions, $ in Millions	1 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2021 EUR (€)	Jun. 30, 2021 USD ($)	Jun. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Disclosure [Abstract]
Commercial paper		$ 2,808		$ 2,527
Other borrowings (primarily non U.S.)		873		724
Total short-term debt		3,681		3,251
Debt Instrument [Line Items]
Carrying Value		11,811		12,903
Less: current portion of long-term debt		(1,827)		(751)
Total long-term debt		9,984		12,152
Total debt		15,492		16,154
Repayments of long-term debt	€ 600	$ 818	$ 78
3.875% Euro denominated notes due 2021
Debt Instrument [Line Items]
Carrying Value				748
Interest rate		3.875%
0.250% Euro denominated notes due 2022
Debt Instrument [Line Items]
Carrying Value		$ 1,188		1,226
Interest rate		0.25%
2.45% Notes due 2022
Debt Instrument [Line Items]
Carrying Value		$ 600		599
Interest rate		2.45%
2.20% Notes due 2022
Debt Instrument [Line Items]
Carrying Value		$ 499		$ 499
Interest rate		2.20%		2.20%
2.70% Notes due 2023
Debt Instrument [Line Items]
Carrying Value		$ 499		$ 499
Interest rate		2.70%
2.00% Euro denominated notes due 2023
Debt Instrument [Line Items]
Carrying Value		$ 800		832
Interest rate		2.00%
5.875% GBP denominated notes due 2023
Debt Instrument [Line Items]
Carrying Value		$ 452		460
Interest rate		5.875%
1.20% Euro denominated notes due 2024
Debt Instrument [Line Items]
Carrying Value		$ 651		671
Interest rate		1.20%
1.875% Euro denominated notes due 2024
Debt Instrument [Line Items]
Carrying Value		$ 374		389
Interest rate		1.875%
2.65% Notes due 2025
Debt Instrument [Line Items]
Carrying Value		$ 399		398
Interest rate		2.65%
1.625% Euro denominated notes due 2025
Debt Instrument [Line Items]
Carrying Value		$ 589		607
Interest rate		1.625%
3.20% Notes due 2026
Debt Instrument [Line Items]
Carrying Value		$ 725		725
Interest rate		3.20%
3.434% Notes due 2026
Debt Instrument [Line Items]
Carrying Value		$ 197		196
Interest rate		3.434%
1.652% Euro denominated notes due 2027
Debt Instrument [Line Items]
Carrying Value		$ 98		100
Interest rate		1.652%
0.250% Euro denominated notes due 2027
Debt Instrument [Line Items]
Carrying Value		$ 887		914
Interest rate		0.25%
1.00% Euro denominated notes due 2028
Debt Instrument [Line Items]
Carrying Value		$ 925		966
Interest rate		1.00%
1.10% Notes due 2030
Debt Instrument [Line Items]
Carrying Value		$ 696		696
Interest rate		1.10%
1.90% Euro denominated notes due 2030
Debt Instrument [Line Items]
Carrying Value		$ 124		127
Interest rate		1.90%
0.550% Euro denominated notes due 2032
Debt Instrument [Line Items]
Carrying Value		$ 881		909
Interest rate		0.55%
3.55% Notes due 2042
Debt Instrument [Line Items]
Carrying Value		$ 664		664
Interest rate		3.55%
2.00% Notes due 2050
Debt Instrument [Line Items]
Carrying Value		$ 296		296
Interest rate		2.00%
Non U.S. borrowings
Debt Instrument [Line Items]
Carrying Value		$ 257		372
Other
Debt Instrument [Line Items]
Carrying Value		10		10
Derivatives Designated as Hedging Instruments: \| Fair Value Hedging \| Interest Rate Swap
Debt Instrument [Line Items]
Fair value decrease in debt related to hedge accounting		$ 58		$ 79