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Accumulated Other Comprehensive Income (Loss), Net of Tax
3 Months Ended
Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax
Three Months Ended March 31, 2023
Accumulated Other Comprehensive Income (Loss) Cash Flow HedgesPension and OPEB PlansAvailable-for-Sale SecuritiesTotal
Millions
Balance as of December 31, 2022$(3)$(426)$(121)$(550)
Other Comprehensive Income (Loss) before Reclassifications(2)— 20 18 
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)10 
Net Current Period Other Comprehensive Income (Loss)(1)26 28 
Balance as of March 31, 2023$(4)$(423)$(95)$(522)
Three Months Ended March 31, 2022
Accumulated Other Comprehensive Income (Loss) Cash Flow HedgesPension and OPEB PlansAvailable-for-Sale SecuritiesTotal
Millions
Balance as of December 31, 2021$(6)$(355)$11 $(350)
Other Comprehensive Income (Loss) before Reclassifications— — (65)(65)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)— 
Net Current Period Other Comprehensive Income (Loss)— (61)(60)
Balance as of March 31, 2022$(5)$(355)$(50)$(410)
 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement
Three Months Ended
March 31, 2023
Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)Location of Pre-Tax Amount In Statement of Operations Pre-Tax AmountTax (Expense) BenefitAfter-Tax Amount
Millions
Cash Flow Hedges
Interest Rate SwapsInterest Expense$(1)$— $(1)
Total Cash Flow Hedges(1)— (1)
Pension and OPEB Plans
Amortization of Prior Service (Cost) CreditNon-Operating Pension and OPEB Credits (Costs)— 
Amortization of Actuarial LossNon-Operating Pension and OPEB Credits (Costs)(7)(5)
Total Pension and OPEB Plans(5)(3)
Available-for-Sale Debt Securities
Realized Gains (Losses) Net Gains (Losses) on Trust Investments(10)(6)
Total Available-for-Sale Debt Securities(10)(6)
Total$(16)$6 $(10)
 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement
Three Months Ended
March 31, 2022
Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)Location of Pre-Tax Amount In Statement of Operations Pre-Tax AmountTax (Expense) BenefitAfter-Tax Amount
Millions
Cash Flow Hedges
Interest Rate SwapsInterest Expense$(1)$— $(1)
Total Cash Flow Hedges(1)— (1)
Pension and OPEB Plans
Amortization of Prior Service (Cost) CreditNon-Operating Pension and OPEB Credits (Costs)(1)
Amortization of Actuarial LossNon-Operating Pension and OPEB Credits (Costs)(5)(4)
Total Pension and OPEB Plans— — — 
Available-for-Sale Debt Securities
Realized Gains (Losses) Net Gains (Losses) on Trust Investments(6)(4)
Total Available-for-Sale Debt Securities(6)(4)
Total$(7)$2 $(5)