Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Deferred tax assets:
Receivables	$ 117	$ 98
Inventory	79	63
Property	191	144
Goodwill and other intangibles	132	0
Employee benefits	97	64
Investment in partnership	228	74
Other accrued expenses	74	91
Operating loss carryforwards	1,525	1,376
Tax credit carryforwards	653	554
Other	232	498
Total deferred income tax asset	3,328	2,962
Valuation allowances	(2,372)	(2,484)
Total deferred income tax asset after valuation allowance	956	478
Deferred tax liabilities:
Goodwill and other intangibles	0	(202)
Undistributed earnings of foreign subsidiaries	(9)	0
Other	(18)	(51)
Total deferred income tax liability	(27)	(253)
Net deferred tax asset	$ 929	$ 225