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Assets Classified as Held for Sale, Liabilities Associated With Assets Held for Sale and Discontinued Operations - Summary of Liabilities Associated With Assets Held for Sale (Detail) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Disclosure of Assets and Liabilities of Disposal Groups Classified as Held for Sale [abstract]    
Balance at the end of previous year $ 1,145 $ 0
Reclassified to liabilities associated with assets held for sale (46) 1,106
Disposals from SAB transaction-related divestitures (1,044) 0
Effect of movements in foreign exchange (55) 39
Balance at the end of year $ 0 $ 1,145