Stockholders' Equity - Components of accumulated other comprehensive income (loss) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2022 USD ($)
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	$ 1,462
Balance at the end of period	1,474
Accumulated other comprehensive income (loss)
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	(53)
Other comprehensive income (loss)	11
Balance at the end of period	(42)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	(1)
Balance at the end of period	(1)
Unrecognized (Loss) Gain on on Interest Rate Swaps
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	(1)
Other comprehensive income (loss)	11
Balance at the end of period	10
Loss on Pension and Other Postretirement Plans
Accumulated Other Comprehensive Income (Loss)
Balance at the beginning of period	(51)
Balance at the end of period	$ (51)