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Business Combinations, Discontinued Operations, Sale of Other Disposal Groups and Selected Financial Information by Reportable Segment and Line of Business - Summary of Combined Condensed Financial Information of Reclassification of Assets and Liabilities Held for Sale (Detail) - United Kingdom United States and Spain [Member]
$ in Millions
Dec. 31, 2020
USD ($)
Disclosure of Discontinued Operations [line items]  
Current assets $ 4
Non-current assets 103
Total assets of the disposal group 107
Total net assets of disposal group $ 107