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SUPPLEMENTAL CASH FLOW INFORMATION
 12 Months Ended
Dec. 31, 2021
Cash Flow Statement [Abstract]  
SUPPLEMENTAL CASH FLOW INFORMATION SUPPLEMENTAL CASH FLOW INFORMATION
 Year ended December 31
(US$ MILLIONS)202120202019
Interest paid$324 $313 $303 
Income taxes paid$87 $9 $44 
Amounts paid and received for interest were reflected as operating cash flows in the consolidated statements of cash flow.
Total cash outflows across the company’s lease contracts were $144 million (2020: $121 million).
Details of “Changes in non-cash working capital, net” on the consolidated statements of cash flow are as follows:
 Year ended December 31
(US$ MILLIONS)202120202019
Accounts receivable$(81)$(9)$214 
Inventory114 127 33 
Prepayments and other20 25 99 
Accounts payable and other(166)(179)(39)
Changes in non-cash working capital, net$(113)$(36)$307 
The following table presents the change in the balance of liabilities arising from financing activities as at December 31, 2021:
(US$ MILLIONS)20212020
Balance at beginning of year$5,189 $5,290 
Cash flows187 (2)
Non-cash changes:
Foreign currency translation(153)(106)
Fair value(24)(44)
Other changes47 51 
Balance at end of year$5,246 $5,189