v3.22.4
Property, plant and equipment (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Property, plant and equipment    
Property, plant and equipment at beginning of period $ 405  
Additions from acquisition 5  
Property, plant and equipment at end of period 449 $ 405
Owned Assets    
Property, plant and equipment    
Property, plant and equipment at beginning of period 215  
Additions from acquisition 3  
Property, plant and equipment at end of period 233 215
Owned Assets | Computer hardware and network assets    
Property, plant and equipment    
Property, plant and equipment at beginning of period 22  
Property, plant and equipment at end of period 18 22
Owned Assets | Buildings and leasehold improvements    
Property, plant and equipment    
Property, plant and equipment at beginning of period 74  
Property, plant and equipment at end of period 85 74
Owned Assets | Furniture and equipment    
Property, plant and equipment    
Property, plant and equipment at beginning of period 93  
Property, plant and equipment at end of period 97 93
Owned Assets | Assets under construction    
Property, plant and equipment    
Property, plant and equipment at beginning of period 26  
Property, plant and equipment at end of period 33 26
Right-of-use lease assets    
Property, plant and equipment    
Property, plant and equipment at beginning of period 405  
Property, plant and equipment at end of period 449 405
Right-of-use lease assets | Buildings and leasehold improvements    
Property, plant and equipment    
Property, plant and equipment at beginning of period 190  
Property, plant and equipment at end of period 216 190
At cost | Owned Assets    
Property, plant and equipment    
Property, plant and equipment at beginning of period 424 363
Additions 92 93
Dispositions, retirements and other 24 (30)
Transfers 0 0
Foreign exchange (18) (2)
Property, plant and equipment at end of period 477 424
At cost | Owned Assets | Computer hardware and network assets    
Property, plant and equipment    
Property, plant and equipment at beginning of period 48 46
Additions 1 4
Dispositions, retirements and other 1 (6)
Transfers 3 3
Foreign exchange (2) 1
Additions from acquisition 0  
Property, plant and equipment at end of period 49 48
At cost | Owned Assets | Buildings and leasehold improvements    
Property, plant and equipment    
Property, plant and equipment at beginning of period 119 95
Additions 8 23
Dispositions, retirements and other 8 (3)
Transfers 22 4
Foreign exchange (5) 0
Additions from acquisition 2  
Property, plant and equipment at end of period 138 119
At cost | Owned Assets | Furniture and equipment    
Property, plant and equipment    
Property, plant and equipment at beginning of period 231 207
Additions 22 43
Dispositions, retirements and other 15 (25)
Transfers 27 7
Foreign exchange (9) (1)
Additions from acquisition 1  
Property, plant and equipment at end of period 257 231
At cost | Owned Assets | Assets under construction    
Property, plant and equipment    
Property, plant and equipment at beginning of period 26 15
Additions 61 23
Dispositions, retirements and other 0 4
Transfers (52) (14)
Foreign exchange (2) (2)
Additions from acquisition 0  
Property, plant and equipment at end of period 33 26
At cost | Right-of-use lease assets    
Property, plant and equipment    
Property, plant and equipment at beginning of period 741 627
Additions 179 155
Dispositions, retirements and other 35 (36)
Transfers 0 0
Foreign exchange (28) (5)
Property, plant and equipment at end of period 862 741
At cost | Right-of-use lease assets | Buildings and leasehold improvements    
Property, plant and equipment    
Property, plant and equipment at beginning of period 317 264
Additions 87 62
Dispositions, retirements and other 11 (6)
Transfers 0 0
Foreign exchange (10) (3)
Additions from acquisition 2  
Property, plant and equipment at end of period 385 317
Accumulated depreciation | Owned Assets    
Property, plant and equipment    
Property, plant and equipment at beginning of period (209) (181)
Dispositions, retirements and other (24) (33)
Foreign exchange (8) 0
Depreciation 67 61
Property, plant and equipment at end of period (244) (209)
Accumulated depreciation | Owned Assets | Computer hardware and network assets    
Property, plant and equipment    
Property, plant and equipment at beginning of period (26) (23)
Dispositions, retirements and other 1 5
Foreign exchange (1) 0
Depreciation 7 8
Property, plant and equipment at end of period (31) (26)
Accumulated depreciation | Owned Assets | Buildings and leasehold improvements    
Property, plant and equipment    
Property, plant and equipment at beginning of period (45) (32)
Dispositions, retirements and other 8 3
Foreign exchange (1) 1
Depreciation 17 15
Property, plant and equipment at end of period (53) (45)
Accumulated depreciation | Owned Assets | Furniture and equipment    
Property, plant and equipment    
Property, plant and equipment at beginning of period (138) (126)
Dispositions, retirements and other 15 25
Foreign exchange (6) (1)
Depreciation 43 38
Property, plant and equipment at end of period (160) (138)
Accumulated depreciation | Owned Assets | Assets under construction    
Property, plant and equipment    
Property, plant and equipment at beginning of period 0 0
Dispositions, retirements and other 0 0
Foreign exchange 0 0
Depreciation 0 0
Property, plant and equipment at end of period 0 0
Accumulated depreciation | Right-of-use lease assets    
Property, plant and equipment    
Property, plant and equipment at beginning of period (336) (265)
Dispositions, retirements and other (35) (39)
Foreign exchange (12) (5)
Depreciation 124 115
Property, plant and equipment at end of period (413) (336)
Accumulated depreciation | Right-of-use lease assets | Buildings and leasehold improvements    
Property, plant and equipment    
Property, plant and equipment at beginning of period (127) (84)
Dispositions, retirements and other 11 6
Foreign exchange (4) (5)
Depreciation 57 54
Property, plant and equipment at end of period $ (169) $ (127)