Income Taxes - Deferred Tax Assets (Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Deferred tax liabilities:
Property, plant and equipment	$ (1,386)	$ (1,369)
Intangible assets	(129)	(169)
Other	25	0
Total deferred tax liabilities	(1,540)	(1,538)
Deferred tax assets:
Payable to affiliate due to post-retirement benefit plan participation	274	284
Other	0	15
Gross deferred tax assets	274	299
Less valuation allowance on deferred tax assets	(8)	(8)
Net deferred tax assets	266	291
Net deferred tax liabilities	$ (1,274)	$ (1,247)