v3.24.1.u1
Retirement Benefits Pension Plan Contributions (Details) - Pension Plan
$ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
Payment for Pension and Other Postretirement Benefits $ 550
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year 1,000
Pension And Other Postretirement Expected Benefit Contributions Unfunded Plans 420
Pension and Other Postretirement Benefit Contributions Unfunded Plans $ 105