Other Financial Data - Other Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Other Liabilities [Abstract]
Defined benefit plans	$ 915	$ 1,004
Non-current contract liabilities	394	363
Unrecognized tax benefits	29	29
Deferred income taxes	72	73
Environmental reserve	123	108
Other	167	114
Other liabilities	$ 1,700	$ 1,691