Pension and Other Postretirement Benefits - Funded Status of Pension and Postretirement Benefit Obligations (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized on the Consolidated Balance Sheets:
Noncurrent liabilities	$ (1,337)	$ (1,458)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Funded status at end of year	(1,204)	(1,298)
Amounts recognized on the Consolidated Balance Sheets:
Current liabilities	(74)	(73)
Noncurrent liabilities	(1,130)	(1,225)
Net amounts recognized	(1,204)	(1,298)
Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Funded status at end of year	(193)	(222)
Amounts recognized on the Consolidated Balance Sheets:
Current liabilities	(30)	(34)
Noncurrent liabilities	(163)	(188)
Net amounts recognized	$ (193)	$ (222)