Benefit Obligations - Schedule of Company Commitments to Fund Benefit Obligations (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($)
Cash contributions to defined benefit pension plans
Defined Benefit Plan Disclosure [Line Items]
Total contributions year-to-date	$ 13
Total expected contributions in current fiscal year	27
Benefit payments to nonqualified pension plans
Defined Benefit Plan Disclosure [Line Items]
Total contributions year-to-date	9
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	2
Total expected contributions in current fiscal year	$ 4