Regulatory Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Regulatory Assets and Liabilities Disclosure [Abstract]

Components of regulatory assets:


(Millions of Dollars)	See Note(s)	Remaining Amortization Period	Dec. 31, 2021				Dec. 31, 2020
Regulatory Assets			Current		Noncurrent		Current		Noncurrent
Pension and retiree medical obligations	9	Various	$	11	$	135	$	12	$	178
Texas revenue surcharges		One to two years	20		64		54		17
Excess deferred taxes — TCJA	7	Various	2		50		3		51
Recoverable deferred taxes on AFUDC		Plant lives	—		41		—		42
Net AROs (a)	1, 10	Various	—		40		—		33
Losses on reacquired debt		Term of related debt	1		19		1		20
Conservation programs (b)	1	One to two years	3		2		1		2
Deferred natural gas and electric energy/fuel costs		One to three years	146		4		—		—
Other		Various	10		25		5		14
Total regulatory assets			$	193	$	380	$	76	$	357

(a)Includes amounts recorded for future recovery of AROs.

(b)Includes costs for conservation programs, as well as incentives allowed in certain jurisdictions.

Regulatory Liabilities

Components of regulatory liabilities:


(Millions of Dollars)	See Note(s)	Remaining Amortization Period	Dec. 31, 2021				Dec. 31, 2020
Regulatory Liabilities			Current		Noncurrent		Current		Noncurrent
Deferred income tax adjustments and TCJA refunds (a)	7	Various	$	15	$	486	$	6	$	513
Plant removal costs	1, 10	Various	—		190		—		177
Revenue subject to refund		One to two years	6		4		4		4
Gain from asset sales		Various	—		2		—		2
Deferred natural gas and electric energy/fuel costs		Less than one year	—		—		35		—
Contract valuation adjustments (b)	1, 8	One to three years	27		1		7		—
Other		Various	6		26		5		22
Total regulatory liabilities			$	54	$	709	$	57	$	718

(a)Includes the revaluation of recoverable/regulated plant accumulated deferred income taxes and revaluation impact of non-plant accumulated deferred income taxes due to the TCJA.

(b)Includes the fair value of certain long-term PPAs used to meet energy capacity requirements..