Environmental (Schedule of Environmental Remediation Reserves) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Environmental Remediation Obligations [Abstract]
Document Period End Date	Dec. 31, 2021
Demerger obligations (Note 20)	$ 24	$ 29
Divestiture obligations (Note 20)	14	15
Active sites	8	12
U.S. Superfund sites	12	11
Other environmental remediation liabilities	2	2
Total	$ 60	$ 69