Income and Other Taxes - Allocation of Income Tax Expense Benefit (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Interperiod Allocaion [Line Items]
Income tax expense	$ (17)	$ 64	$ 179
Discontinued operations	0	0	95
Total Income Tax Expense	121	105	226
Changes in defined benefit plans
Income Tax Interperiod Allocaion [Line Items]
Other comprehensive income (loss), tax	143	43	(55)
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	(4)	(3)	8
Retained Earnings
Income Tax Interperiod Allocaion [Line Items]
Other comprehensive income (loss), tax	$ 0	$ 0	$ 0