Equity - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Cumulative translation adjustment - net of taxes	$ (3,932)	$ (2,818)
Derivatives - net of taxes	60	4
Pension / OPEB (net of $507 million and $560 million tax benefit in September 30, 2021 and December 31, 2020, respectively)	(1,746)	(1,876)
Accumulated other comprehensive income (loss)	(5,618)	(4,690)
Pension / OPEB funded status obligation, tax benefit	507	560
Americas
Segment Reporting Information [Line Items]
Cumulative translation adjustment - net of taxes	(3,958)	(3,788)
EMEA
Segment Reporting Information [Line Items]
Cumulative translation adjustment - net of taxes	382	1,020
APAC
Segment Reporting Information [Line Items]
Cumulative translation adjustment - net of taxes	77	616
Engineering
Segment Reporting Information [Line Items]
Cumulative translation adjustment - net of taxes	104	354
Other
Segment Reporting Information [Line Items]
Cumulative translation adjustment - net of taxes	$ (537)	$ (1,020)