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Segment Reporting - Revenues by Geographic Area (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue from External Customer [Line Items]
Sales	$ 12,080	$ 12,057
United States
Revenue from External Customer [Line Items]
Sales	5,136	5,137
Europe, Middle East and Africa
Revenue from External Customer [Line Items]
Sales	3,729	3,534
China
Revenue from External Customer [Line Items]
Sales	927	864
Asia Pacific (other than China and Japan)
Revenue from External Customer [Line Items]
Sales	751	728
Japan
Revenue from External Customer [Line Items]
Sales	730	811
Latin America
Revenue from External Customer [Line Items]
Sales	569	556
Other
Revenue from External Customer [Line Items]
Sales	$ 238	$ 427

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