Income and Other Taxes - Allocation of Income Tax Expense Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Interperiod Allocaion [Line Items]
Pre-tax loss	$ (29)	$ (3)	$ (17)
Total Income Tax Expense	65	66	121
Changes in defined benefit plans
Income Tax Interperiod Allocaion [Line Items]
Other comprehensive income (loss), tax	93	70	143
Cash flow hedges
Income Tax Interperiod Allocaion [Line Items]
Other comprehensive income (loss), tax	1	(1)	(1)
Translation adjustments
Income Tax Interperiod Allocaion [Line Items]
Other comprehensive income (loss), tax	$ 0	$ 0	$ (4)