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Investment in Associates and Joint Ventures - Summary of Financial Information of Material Associate Investment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure of associates [line items] |  |  |
Non-current assets | $ 3,041 | $ 2,719 | $ 2,461
Current assets | 916 | 1,373 | 861
Current liabilities | (1,365) | (1,407) | (1,306)
Non-current liabilities | (4,054) | (3,816) | (3,370)
Net assets | (1,465) | (1,131) | (1,354)
Revenue | 4,627 | 4,337 | 4,075
Profit/(loss) for the period | 386 | 350 | $ 535
Barclay associate [member] |  |  |
Disclosure of associates [line items] |  |  |
Non-current assets | 515 | 529 |
Current assets | 75 | 70 |
Current liabilities | (22) | (17) |
Non-current liabilities | (323) | (319) |
Net assets | 245 | 263 |
Revenue | 108 | 103 |
Profit/(loss) for the period | (17) | (13) |
Group's share of loss for the period, including the cost of funding owner returns | (10) | (8) |
Barclay associate [member] | Group share of reported net assets at 19.9% [member] |  |  |
Disclosure of associates [line items] |  |  |
Net assets | 49 | 52 |
Adjustments to reflect capitalised costs, and additional rights and obligations under the shareholder agreement | 4 | 7 |
Carrying amount | $ 53 | $ 59 |

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