Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Fixed assets	$ (33)	$ (57)
Operating lease right-of-use assets	(14)	(15)
Investment in partnership	(26)	(20)
Other	(8)	(5)
Deferred income tax liabilities	(81)	(97)
Fixed assets	178	297
Pension and OPEB plans	300	408
Net operating loss and deduction limitation carryforwards	572	660
Net capital loss carryforwards	41	41
Undeducted research and development expenditures	145	195
Tax credit carryforwards	99	98
Operating lease liabilities	14	15
Goodwill	27	28
Other	69	44
Deferred income tax assets	1,445	1,786
Valuation allowance	(711)	(774)
Net deferred income tax assets	653	915
Amounts recognized in our Consolidated Balance Sheets consisted of:
Deferred income tax assets	$ 653	$ 915

Deferred tax assets net current and non current classification.

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