Pension and Other Postretirement Benefits (Amounts Recognized in Consolidated Balance Sheet) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Noncurrent liabilities	$ (1,114)	$ (1,015)
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(7)	(11)
Noncurrent liabilities	(514)	(241)
Accrued benefit cost	(521)	(252)
Other Benefits
Defined Benefit Plan Disclosure [Line Items]
Current liabilities	(50)	(54)
Noncurrent liabilities	(600)	(774)
Accrued benefit cost	$ (650)	$ (828)