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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables)
6 Months Ended
Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Changes in Accumulated Other Comprehensive Income by Component
Three Months Ended June 30, 2023
Accumulated Other Comprehensive Income (Loss) Cash Flow HedgesPension and OPEB PlansAvailable-for-Sale SecuritiesTotal
Millions
Balance as of March 31, 2023$(4)$(423)$(95)$(522)
Other Comprehensive Income (Loss) before Reclassifications12 — (12)— 
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)(1)
Net Current Period Other Comprehensive Income (Loss)11 (8)
Balance as of June 30, 2023$7 $(419)$(103)$(515)
Three Months Ended June 30, 2022
Accumulated Other Comprehensive Income (Loss) Cash Flow HedgesPension and OPEB PlansAvailable-for-Sale SecuritiesTotal
Millions
Balance as of March 31, 2022 $(5)$(355)$(50)$(410)
Other Comprehensive Income (Loss) before Reclassifications— — (53)(53)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)— 
Net Current Period Other Comprehensive Income (Loss)— (46)(45)
Balance as of June 30, 2022$(5)$(354)$(96)$(455)
Six Months Ended June 30, 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 Reclassifications10 — 18 
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)— 10 17 
Net Current Period Other Comprehensive Income (Loss)10 18 35 
Balance as of June 30, 2023$7 $(419)$(103)$(515)
Six Months Ended June 30, 2022
Accumulated Other Comprehensive Income (Loss) Cash Flow HedgesPension and OPEB PlansAvailable-for-Sale SecuritiesTotal
Millions
Balance as of December 31, 2021$(6)$(355)$11 $(350)
Other Comprehensive Income (Loss) before Reclassifications— — (118)(118)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)11 13 
Net Current Period Other Comprehensive Income (Loss)(107)(105)
Balance as of June 30, 2022$(5)$(354)$(96)$(455)
Reclassifications out of Accumulated Other Comprehensive Income
 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement
Three Months EndedSix Months Ended
June 30, 2023June 30, 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 AmountPre-Tax AmountTax (Expense) BenefitAfter-Tax Amount
Millions
Cash Flow Hedges
Interest Rate SwapsInterest Expense$$— $$— $— $— 
Total Cash Flow Hedges— — — — 
Pension and OPEB Plans
Amortization of Prior Service (Cost) CreditNon-Operating Pension and OPEB Credits (Costs)(1)(1)
Amortization of Actuarial LossNon-Operating Pension and OPEB Credits (Costs)(7)(5)(14)(10)
Total Pension and OPEB Plans(5)(4)(10)(7)
Available-for-Sale Debt Securities
Realized Gains (Losses) Net Gains (Losses) on Trust Investments(7)(4)(17)(10)
Total Available-for-Sale Debt Securities(7)(4)(17)(10)
Total$(11)$4 $(7)$(27)$10 $(17)
 Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement
Three Months EndedSix Months Ended
June 30, 2022June 30, 2022
Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)Location of Pre-Tax Amount In Statement of Operations Pre-Tax AmountTax (Expense) BenefitAfter-Tax AmountPre-Tax AmountTax (Expense) BenefitAfter-Tax Amount
Millions
Cash Flow Hedges
Interest Rate SwapsInterest Expense$(1)$$— $(2)$$(1)
Total Cash Flow Hedges(1)— (2)(1)
Pension and OPEB Plans
Amortization of Prior Service (Cost) CreditNon-Operating Pension and OPEB Credits (Costs)(2)10 (3)
Amortization of Actuarial LossNon-Operating Pension and OPEB Credits (Costs)(6)(4)(11)(8)
Total Pension and OPEB Plans(1)— (1)(1)— (1)
Available-for-Sale Debt Securities
Realized Gains (Losses) Net Gains (Losses) on Trust Investments(12)(7)(18)(11)
Total Available-for-Sale Debt Securities(12)(7)(18)(11)
Total$(14)$6 $(8)$(21)$8 $(13)