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Fair Value of Financial Assets and Liabilities (Tables)
 12 Months Ended
Dec. 31, 2022
Fair Value Disclosures [Abstract]  
Cost and Fair Value of Nuclear Decommissioning Fund Investments
Non-derivative instruments with recurring fair value measurements in the nuclear decommissioning fund:
Dec. 31, 2022
Fair Value
(Millions of Dollars)CostLevel 1Level 2Level 3NAVTotal
Nuclear decommissioning fund (a)
Cash equivalents$29 $29 $— $— $— $29 
Commingled funds803 — — — 1,178 1,178 
Debt securities738 — 669 6 — 675 
Equity securities406 999 1 — — 1,000 
Total$1,976 $1,028 $670 $6 $1,178 $2,882 
(a)Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $219 million of equity method investments and $133 million of rabbi trust assets and other miscellaneous investments.
Dec. 31, 2021
Fair Value
(Millions of Dollars)CostLevel 1Level 2Level 3NAVTotal
Nuclear decommissioning fund (a)
Cash equivalents$64 $64 $— $— $— $64 
Commingled funds856 — — — 1,294 1,294 
Debt securities631 — 666 9 — 675 
Equity securities411 1,222 1 — — 1,223 
Total$1,962 $1,286 $667 $9 $1,294 $3,256 
(a)Reported in nuclear decommissioning fund and other investments on the consolidated balance sheets, which also includes $208 million of equity investments in unconsolidated subsidiaries and $164 million of rabbi trust assets and other miscellaneous investments.
Final Contractual Maturity Dates of Debt Securities in the Nuclear Decommissioning Fund by Asset Class
Contractual maturity dates of debt securities in the nuclear decommissioning fund as of Dec. 31, 2022:
Final Contractual Maturity
(Millions of Dollars)Due in 1 Year or LessDue in 1 to 5 YearsDue in 5 to 10 YearsDue after 10 YearsTotal
Debt securities$6 $204 $250 $215 $675 
Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]
Gross notional amounts of commodity forwards, options and FTRs:
(Amounts in Millions) (a)(b)
Dec. 31, 2022Dec. 31, 2021
MWh of electricity61 80 
MMBtu of natural gas131 156 
(a)Not reflective of net positions in the underlying commodities.
(b)Notional amounts for options included on a gross basis but weighted for the probability of exercise.
Derivative Instruments, Gain (Loss) [Table Text Block]
Impact of derivative activity:
Pre-Tax Fair Value Gains (Losses) Recognized During the Period in:
(Millions of Dollars)Accumulated Other Comprehensive LossRegulatory (Assets) and Liabilities
Year Ended Dec. 31, 2022
Derivatives designated as cash flow hedges
Interest rate$22 $— 
Total$22 $— 
Other derivative instruments
Electric commodity$— $(10)
Natural gas commodity— (16)
Total$— $(26)
Year Ended Dec. 31, 2021
Interest rate$5 $— 
Total$5 $— 
Other derivative instruments
Electric commodity$— $32 
Natural gas commodity— (4)
Total$— $28 
Year Ended Dec. 31, 2020
Interest rate$(13)$— 
Total$(13)$— 
Other derivative instruments
Electric commodity$— $(5)
Natural gas commodity— (13)
Total$— $(18)
Pre-Tax (Gains) Losses
Reclassified into Income
During the Period from:		Pre-Tax Gains
(Losses) Recognized
During the Period in Income
(Millions of Dollars)Accumulated
Other
Comprehensive Loss		Regulatory
Assets and (Liabilities)
Year Ended Dec. 31, 2022
Derivatives designated as cash flow hedges
Interest rate$7 
(a)
$— $— 
Total$7 $— $— 
Other derivative instruments
Commodity trading$— $— $25 
(b)
Electric commodity— 3 
(c)
— 
Natural gas commodity— 10 
(d)
(27)
(d)(e)
Total$— $13 $(2)
Year Ended Dec. 31, 2021
Derivatives designated as cash flow hedges
Interest rate$8 
(a)
$— $— 
Total$8 $— $— 
Other derivative instruments
Commodity trading$— $— $63 
(b)
Electric commodity— (23)
(c)
— 
Natural gas commodity— 5 
(d)
(22)
(d)(e)
Total$— $(18)$41 
Year Ended Dec. 31, 2020
Derivatives designated as cash flow hedges
Interest rate$7 
(a)
$— $— 
Total$7 $— $— 
Other derivative instruments
Commodity trading$— $— $(1)
(b)
Electric commodity— (3)
(c)
— 
Natural gas commodity— 10 
(d)
(13)
(d)(e)
Total$— $7 $(14)
(a)Recorded to interest charges.
(b)Recorded to electric revenues. Presented amounts do not reflect non-derivative transactions or margin sharing with customers.
(c)Recorded to electric fuel and purchased power. These derivative settlement gains and losses are shared with electric customers through fuel and purchased energy cost-recovery mechanisms and reclassified out of income as regulatory assets or liabilities, as appropriate. FTR settlements are shared with customers and do not have a material impact on net income. Presented amounts reflect changes in fair value between auction and settlement dates, but exclude the original auction fair value.
(d)Recorded to cost of natural gas sold and transported. These losses are subject to cost-recovery mechanisms and reclassified out of income to a regulatory asset, as appropriate.
(e)Relates primarily to option premium amortization.
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Table Text Block]
Changes in Level 3 commodity derivatives:
Year Ended Dec. 31
(Millions of Dollars)202220212020
Balance at Jan. 1$19 $(49)$4 
Purchases (a)
406 65 51 
Settlements (a)
(350)(158)(73)
Net transactions recorded during the period:
Gains (losses) recognized in earnings (b)
151 49 (39)
Net gains recognized as regulatory assets and liabilities (a)
10 112 8 
Balance at Dec. 31$236 $19 $(49)
(a)Relates primarily to NSP-Minnesota and SPS FTR instruments administered by MISO and SPP.
(b)Relates to commodity trading and is subject to substantial offsetting losses and gains on derivative instruments categorized as levels 1 and 2 in the income statement. See above tables for the income statement impact of derivative activity, including commodity trading gains and losses.
Fair Value, by Balance Sheet Grouping [Table Text Block]
As of Dec. 31, other financial instruments for which the carrying amount did not equal fair value:
20222021
(Millions of Dollars)Carrying AmountFair ValueCarrying AmountFair Value
Long-term debt, including current portion$23,964 $20,897 $22,380 $25,232