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Assets Classified as Held for Sale, Liabilities Associated With Assets Held for Sale and Discontinued Operations - Schedule of 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 $ 10,013 $ 39
Reclassified to assets held for sale in the period 145 9,692
Disposals (9,540) (59)
Effect of movements in foreign exchange (490) 341
Balance at the end of year $ 128 $ 10,013