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Equity Accounted Investees, Other Investments and Non-Current Accounts Receivable - Summary of Combined Condensed Statement of Financial Position (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Disclosure of associates [line items] |  |
Current assets | $ 4,235 | $ 4,579
Non-current assets | 23,190 | 24,784
Total assets | 27,425 | 29,363
Current liabilities | 5,352 | 5,409
Non-current liabilities | 13,121 | 13,130
Total liabilities | 18,473 | 18,539
Total net assets | 8,952 | 10,824
Associates [member] |  |
Disclosure of associates [line items] |  |
Current assets | 1,240 | 982
Non-current assets | 1,662 | 1,757
Total assets | 2,902 | 2,739
Current liabilities | 496 | 326
Non-current liabilities | 766 | 898
Total liabilities | 1,262 | 1,224
Total net assets | $ 1,640 | $ 1,515

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