v3.22.4
Additional financial information - Changes in liabilities arising from financing activities (Details) - Long-term debt - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Changes in liabilities arising from financing activities      
Beginning of year $ 1,148 $ 1,766  
Issued or received 411 71 $ 1,854
Redemptions, repayments or payments (690) (765) (819)
Foreign exchange movement (7) (3) 12
Other 102 79 198
End of year 964 1,148 1,766
Beginning of year      
Changes in liabilities arising from financing activities      
Beginning of year     521
Credit facility      
Changes in liabilities arising from financing activities      
Beginning of year 941 1,568  
Issued or received 411 71 1,854
Redemptions, repayments or payments (610) (698) (622)
Foreign exchange movement 0 0 0
Other 0 0 0
End of year 742 941 1,568
Credit facility | Beginning of year      
Changes in liabilities arising from financing activities      
Beginning of year     336
Lease liabilities      
Changes in liabilities arising from financing activities      
Beginning of year 215 209  
Issued or received 0 0 0
Redemptions, repayments or payments (72) (67) (59)
Foreign exchange movement (7) (3) 12
Other 100 76 67
End of year 236 215 209
Lease liabilities | Beginning of year      
Changes in liabilities arising from financing activities      
Beginning of year     189
Deferred debt transaction costs      
Changes in liabilities arising from financing activities      
Beginning of year (8) (11)  
Issued or received 0 0 0
Redemptions, repayments or payments (8) 0 0
Foreign exchange movement 0 0 0
Other 2 3 (7)
End of year $ (14) (8) (11)
Deferred debt transaction costs | Beginning of year      
Changes in liabilities arising from financing activities      
Beginning of year     (4)
Other      
Changes in liabilities arising from financing activities      
Beginning of year   $ 0  
Issued or received     0
Redemptions, repayments or payments     (138)
Foreign exchange movement     0
Other     138
End of year     0
Other | Beginning of year      
Changes in liabilities arising from financing activities      
Beginning of year     $ 0