Cristal Acquisition and Related Divestitures, Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ / shares in Units, $ in Millions		6 Months Ended
	Apr. 10, 2019	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Purchase Price Consideration [Abstract]
Cash consideration paid		$ 1,603	$ 0
Fair Value of Assets Acquired [Abstract]
Goodwill		$ 68		$ 0
Cristal's Titanium Dioxide Business [Member]
Purchase Price Consideration [Abstract]
Tronox Holdings plc shares issued (in shares)	37,580,000
Tronox Holdings plc closing price per share on April 10, 2019 (in dollars per share)	$ 14.00
Total fair value of Tronox Holdings plc shares issued at acquisition date	$ 526
Cash consideration paid	1,603
Liability for additional cash consideration	72
Total purchase price	2,201
Fair Value of Assets Acquired [Abstract]
Accounts receivable	231
Inventory	706
Deferred taxes	70
Prepaid and other assets	104
Property, plant and equipment	624
Mineral leaseholds	57
Intangible assets	69
Lease right of use assets	39
Other long-term assets	59
Assets held for sale	807
Goodwill	68
Total assets acquired	2,834
Less: Liabilities Assumed [Abstract]
Accounts payable	92
Accrued liabilities	127
Short-term lease liabilities	12
Pension and postretirement healthcare benefits	67
Deferred tax liabilities	5
Environmental liabilities	36
Asset retirement obligations	80
Long-term debt	21
Long-term lease liabilities	24
Other long-term liabilities	20
Liabilities held for sale	113
Total liabilities assumed	597
Less noncontrolling interest	36
Purchase price	$ 2,201