Contingencies and Commitments - Accrued Liabilities for Remediation Activities Included in Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Line Items]
Accrued liabilities for remediation activities	$ 158	$ 146	$ 186
Accounts payable
Commitments and Contingencies Disclosure [Line Items]
Accrued liabilities for remediation activities	65	43
Deferred credits and other noncurrent liabilities
Commitments and Contingencies Disclosure [Line Items]
Accrued liabilities for remediation activities	$ 93	$ 103