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Debt - Long-term And Short-term Debt (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2018	Dec. 31, 2019
Debt Disclosure [Abstract]
Commercial paper and U.S. bank borrowings	$ 3,994		$ 996
Other bank borrowings (primarily international)	854		736
Total short-term debt	4,848		1,732
Debt Instrument [Line Items]
Long-term debt	12,027		12,224
Obligations under finance leases	137
Obligations under finance leases			149
Less: current portion of long-term debt	(2,006)		(1,531)
Total long-term debt	10,021		10,693
Total debt	16,875		13,956
2.25% Notes due 2020
Debt Instrument [Line Items]
Long-term debt	$ 300		300
Interest rate	2.25%
1.75% Euro denominated notes due 2020
Debt Instrument [Line Items]
Long-term debt	$ 1,113		1,137
Interest rate	1.75%
0.634% Euro denominated notes due 2020
Debt Instrument [Line Items]
Long-term debt	$ 55		56
Interest rate	0.634%
4.05% Notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 499		499
Interest rate	4.05%
3.875% Euro denominated notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 694		711
Interest rate	3.875%
3.00% Notes due 2021
Debt Instrument [Line Items]
Long-term debt	$ 499		499
Interest rate	3.00%
0.250% Euro denominated notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 1,110		1,129
Interest rate	0.25%
2.45% Notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 599		599
Interest rate	2.45%
2.20% Notes due 2022
Debt Instrument [Line Items]
Long-term debt	$ 499		499
Interest rate	2.20%
2.70% Notes due 2023
Debt Instrument [Line Items]
Long-term debt	$ 499		499
Interest rate	2.70%
2.00% Euro denominated notes due 2023
Debt Instrument [Line Items]
Long-term debt	$ 761		776
Interest rate	2.00%
5.875% GBP denominated notes due 2023
Debt Instrument [Line Items]
Long-term debt	$ 428		456
Interest rate	5.875%
1.20% Euro denominated notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 605		615
Interest rate	1.20%
1.875% Euro denominated notes due 2024
Debt Instrument [Line Items]
Long-term debt	$ 356		361
Interest rate	1.875%
2.65% Notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 398		398
Interest rate	2.65%
1.625% Euro denominated notes due 2025
Debt Instrument [Line Items]
Long-term debt	$ 547		556
Interest rate	1.625%
3.20% Notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 725		725
Interest rate	3.20%
3.434% Notes due 2026
Debt Instrument [Line Items]
Long-term debt	$ 196		196
Interest rate	3.434%
1.652% Euro denominated notes due 2027
Debt Instrument [Line Items]
Long-term debt	$ 91		93
Interest rate	1.652%
1.00% Euro denominated notes due 2028
Debt Instrument [Line Items]
Long-term debt	$ 865		872
Interest rate	1.00%
1.90% Euro denominated notes due 2030
Debt Instrument [Line Items]
Long-term debt	$ 117		118
Interest rate	1.90%
3.55% Notes due 2042
Debt Instrument [Line Items]
Long-term debt	$ 662		662
Interest rate	3.55%
Other
Debt Instrument [Line Items]
Long-term debt	$ 10		10
International bank borrowings
Debt Instrument [Line Items]
Long-term debt	262		$ 309
Designated as Hedging Instrument \| Fair Value Hedging \| Interest Rate Swap
Debt Instrument [Line Items]
Fair value decrease in debt related to hedge accounting	$ 9	$ 38