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Interest-Bearing Loans and Borrowings - Summary of Changes in the Company's Liabilities Arising from Financing Activities (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Proceeds from borrowings $ 454 $ 14,822 $ 22,584 [1]
Payments on borrowings (8,965) (23,116) (30,592) [1]
Amortized cost 110,904 119,372  
Long-term debt, net of current portion [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Balance beginning 95,478 97,564 106,997
Proceeds from borrowings 148 11,226 17,939
Payments on borrowings (6,735) (13,596) (22,339)
Capitalization / (payment) of lease liabilities 697 394 420
Amortized cost 64 71 75
Unrealized foreign exchange effects (2,149) 2,521 (538)
Current portion of long-term debt (875) (3,744) (4,769)
Liabilities associated with assets held for sale     (69)
Other movements     (152)
Loss on bond redemption and other movements 741 1,042  
Balance ending 87,369 95,478 97,564
Short-term debt and current portion of long-term debt [member]      
Disclosure of reconciliation of liabilities arising from financing activities [line items]      
Balance beginning 3,081 5,410 4,584
Proceeds from borrowings 306 3,596 4,645
Payments on borrowings (2,230) (9,520) (8,253)
Capitalization / (payment) of lease liabilities (547) (484) (441)
Amortized cost 0 17 13
Unrealized foreign exchange effects (88) 241 (39)
Current portion of long-term debt 875 3,744 4,769
Liabilities associated with assets held for sale     (15)
Other movements     147
Loss on bond redemption and other movements 10 77  
Balance ending $ 1,408 $ 3,081 $ 5,410
[1] The consolidated statement of cash flows for 2019 has been restated to include operating, investing and financing activities from discontinued operations separately in the cashflow statement. In addition, the 2019 cash flow from investing activities has been restated to reflect reclassification of the cash flow hedges in relation to the Australia divestiture reported in the financing activities in 2019 and recycled to profit or loss upon the completion of the transaction.