Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets:
Operating & capital loss carryforwards	$ 1,977	$ 2,065
Tax credit & other carryforwards	399	419
Property	127	156
Employee benefits	62	116
Goodwill and other intangibles	46	97
Receivables	94	72
Inventory	53	61
Other	163	112
Total deferred income tax asset	2,921	3,098
Valuation allowances	(2,366)	(2,432)
Total deferred income tax asset after valuation allowance	555	666
Deferred tax liabilities:
Other	(34)	(4)
Total deferred income tax liability	(34)	(4)
Net deferred tax asset	522	$ 662
Capital loss carryforwards	$ 30