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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 ($)
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