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Assets Held For Sale and Other Current Assets - Summary of Assets and liabilities Held for Sale (Detail) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Asset held for sale and discontinued operations [line items]    
Assets $ 187 $ 839
Liabilities 6 37
Net assets 181 802
White cement assets in Spain [member]    
Asset held for sale and discontinued operations [line items]    
Assets 107 106
Net assets 107 106
Kosmos' assets in the United States [member]    
Asset held for sale and discontinued operations [line items]    
Assets   457
Liabilities   14
Net assets   443
Assets in the United Kingdom [member]    
Asset held for sale and discontinued operations [line items]    
Assets   229
Liabilities   23
Net assets   206
Other assets held for sale [member]    
Asset held for sale and discontinued operations [line items]    
Assets [1] 80 47
Liabilities [1] 6  
Net assets [1] $ 74 $ 47
[1] In 2020, includes assets and liabilities of $26 and $6, respectively, associated with a committed sale of certain assets in France negotiated in December 2020.