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Property, Plant, and Equipment (Tables)
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property, Plant, and Equipment [Table Text Block]
The following table presents nonregulated and regulated Property, plant, and equipment – net as presented on the Consolidated Balance Sheet for the years ended:
Estimated
Useful Life  (1)
(Years)		Depreciation
Rates (1)
(%)		December 31,
20212020
   (Millions)
Nonregulated:
Natural gas gathering and processing facilities
5 - 40
$18,203 $17,813 
Construction in progressNot applicable331 289 
Oil and gas propertiesUnits of production572 98 
Other
0 - 45
2,649 2,560 
Regulated:
Natural gas transmission facilities
1.25 - 7.13
19,201 18,688 
Construction in progressNot applicableNot applicable475 382 
Other
5 - 45
0.00 - 33.33
2,753 2,659 
Total property, plant, and equipment, at cost44,184 42,489 
Accumulated depreciation and amortization(14,926)(13,560)
Property, plant, and equipment — net$29,258 $28,929 
__________
(1)    Estimated useful life and depreciation rates are presented as of December 31, 2021. Depreciation rates and estimated useful lives for regulated assets are prescribed by the FERC.
Schedule of Change in Asset Retirement Obligation
The following table presents the significant changes to our ARO, of which $1.59 billion and $1.159 billion are included in Regulatory liabilities, deferred income, and other with the remaining current portion in Accrued liabilities at December 31, 2021 and 2020, respectively.
 December 31,
 20212020
 (Millions)
Balance at beginning of year$1,222 $1,165 
Liabilities incurred (1)336 37 
Liabilities settled(25)(19)
Accretion73 65 
Revisions (2)59 (26)
Balance at end of year$1,665 $1,222 
___________
(1)Includes $307 million and $31 million of ARO in 2021 and 2020, respectively, related to acquired upstream properties.
(2)Several factors are considered in the annual review process, including inflation rates, current estimates for removal cost, market risk premiums, discount rates, and the estimated remaining useful life of the assets. The 2021 revisions reflect changes in removal cost estimates, increases in the estimated remaining useful life of certain assets, increases in inflation rates, and new removal estimates. The 2020 revisions reflect changes in removal cost estimates, increases in the estimated remaining useful life of certain assets, decreases in inflation rates, and decreases in the discount rates used in the annual review process.