v3.26.1
Defined Benefit Plans - Pension Plan Assets Measured at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Jun. 30, 2025
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount $ 1,467 $ 1,684
Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 158 257
Debt securities (1)    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 654 724
Real estate    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 174 149
Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 407 308
Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 31 204
Other    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 43 42
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 128 700
Level 1 | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 152 133
Level 1 | Debt securities (1)    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount (65) 365
Level 1 | Real estate    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 9 8
Level 1 | Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 0 0
Level 1 | Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 24 187
Level 1 | Other    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 8 7
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 826 511
Level 2 | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 6 124
Level 2 | Debt securities (1)    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 719 256
Level 2 | Real estate    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 66 87
Level 2 | Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 0 0
Level 2 | Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 7 17
Level 2 | Other    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 28 27
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 513 473
Level 3 | Equity securities    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 0 0
Level 3 | Debt securities (1)    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 0 103
Level 3 | Real estate    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 99 54
Level 3 | Insurance contracts    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 407 308
Level 3 | Cash and cash equivalents    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount 0 0
Level 3 | Other    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, plan assets, amount $ 7 $ 8