Benefit Obligations - Schedule of Company Commitments to Fund Benefit Obligations (Details) $ in Millions	9 Months Ended
	Sep. 30, 2025 USD ($)
Cash contributions to defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Total contributions year-to-date	$ 19
Total expected contributions in current fiscal year	30
Benefit payments to nonqualified pension plans
Defined Benefit Plan Disclosure [Line Items]
Total contributions year-to-date	14
Total expected contributions in current fiscal year	18
Benefit payments to other postretirement benefit plans
Defined Benefit Plan Disclosure [Line Items]
Total contributions year-to-date	5
Total expected contributions in current fiscal year	$ 3