Retirement Benefits Pension Plan Contributions (Details) - Pension Plan $ in Millions |
3 Months Ended |
---|---|
Mar. 31, 2025
USD ($)
| |
Defined Benefit Plan Disclosure [Line Items] | |
Payment for Pension and Other Postretirement Benefits | $ 234 |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 800 |
Pension And Other Postretirement Expected Benefit Contributions Unfunded Plans | 450 |
Pension and Other Postretirement Benefit Contributions Unfunded Plans | $ 106 |