Stockholders' Equity Table Of Changes In AOCI (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance			$ (96)
Other comprehensive income (loss)	$ (10)	$ 29	(14)	$ 23
Total, Ending Balance	(110)		(110)
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance			(96)
Other comprehensive income (loss) before reclassifications			(26)
Amounts reclassified from accumulated other comprehensive income (loss)			12
Other comprehensive income (loss)	(10)	$ 29	(14)	$ 23
Total, Ending Balance	(110)		(110)
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance			(3)
Other comprehensive income (loss) before reclassifications			(26)
Amounts reclassified from accumulated other comprehensive income (loss)			6
Other comprehensive income (loss)			(20)
Total, Ending Balance	(23)		(23)
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance			(1)
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified from accumulated other comprehensive income (loss)			0
Other comprehensive income (loss)			0
Total, Ending Balance	(1)		(1)
Pension and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total, Beginning Balance			(92)
Other comprehensive income (loss) before reclassifications			0
Amounts reclassified from accumulated other comprehensive income (loss)			6
Other comprehensive income (loss)			6
Total, Ending Balance	$ (86)		$ (86)