Dispositions and Other Transactions - Summary of Assets Held for Sale (Details) - Algeria Africa Assets - Discontinued Operations, Disposed of by Sale $ in Millions	Dec. 31, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	$ 249
Property, plant and equipment, net	1,761
Long-term receivables and other assets, net	146
Total Assets	2,156
Current liabilities	188
Non-current liabilities	104
Total Liabilities	$ 292