Contingencies and Commitments - Changes in Accrued Liabilities for Remediation Activities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Change in Accrued Liabilities for Remediation Activities [Roll Forward]
Beginning of period	$ 146	$ 186
Accruals for environmental remediation deemed probable and reasonably estimable	43	7
Obligations settled	(31)	(47)
End of period	$ 158	$ 146