Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2021

Asset Retirement Obligation Disclosure [Abstract]

Schedule of Asset Retirement Obligations [Table Text Block]

The following table presents amounts recognized related to asset retirement obligations for the periods indicated (in millions):

	2021		2020
Balance at January 1	$	462	$	428
Additional liabilities incurred	27		42
Liabilities assumed in acquisition	96		—
Liabilities settled	(15)		(20)
Accretion expense	22		22
Change in estimated cash flows	13		3
Sale of plants	—		(13)
Other	1		—
Balance at December 31	$	606	$	462