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Retirement and Benefit Plans - Schedule of Qualified Plan Assets at Fair Value (Details) - Pension Plan $ in Millions | Jun. 30, 2026 USD ($)
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Defined Benefit Plan, Plan Assets, Category [Line Items] |
Plan assets at fair value | $ 3,021
Interest receivable excluded from plan assets | 19
Level 1 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 698
Level 2 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 987
Level 3 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 0
Total Fair Value |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 1,685
Debt Securities | Level 1 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 698
Debt Securities | Level 2 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 987
Debt Securities | Level 3 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 0
Debt Securities | Total Fair Value |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 1,685
U.S. Treasury and federal agencies securities | Level 1 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 698
U.S. Treasury and federal agencies securities | Level 2 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 9
U.S. Treasury and federal agencies securities | Level 3 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 0
U.S. Treasury and federal agencies securities | Total Fair Value |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 707
Asset-Backed Securities | Level 1 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 0
Asset-Backed Securities | Level 2 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 915
Asset-Backed Securities | Level 3 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 0
Asset-Backed Securities | Total Fair Value |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 915
Private Placement Securities | Level 1 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 0
Private Placement Securities | Level 2 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 63
Private Placement Securities | Level 3 |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 0
Private Placement Securities | Total Fair Value |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | 63
Collective Investment Funds | Investments measured at NAV |
Defined Benefit Plan, Plan Assets, Category [Line Items] |
Fair value of plan assets | $ 1,336

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