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Asset Retirement Obligation (Tables)

12 Months Ended

Dec. 31, 2020

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):

						2020						2019
Balance at January 1						$	428					$	415
Additional liabilities incurred						42						19
Liabilities settled						(20)						(12)
Accretion expense						22						21
Change in estimated cash flows						3						58
Sale of plants						(13)						(71)
Other						—						(2)
Balance at December 31						$	462					$	428

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- References

No definition available.

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- Definition

Tabular disclosure of the carrying amount of a liability for asset retirement obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 410
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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