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Other assets and liabilities F.5. Assets and liabilities related to contract with customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Contract Assets [Line Items]    
Contract assets, net $ 88 $ 77
Contract liabilities    
Short-term portion 144 121
Revenue that was included in contract liability balance at beginning of period 117 131
Transaction price allocated to remaining performance obligations 120  
Contract Costs, Net [Roll Forward]    
Contract costs, net, beginning of period 26 12
Change in scope 13 0
Contract costs capitalized 5 5
Amortization of contract costs (4) (5)
Contract costs, net, end of period 12 12
1 year    
Contract liabilities    
Transaction price allocated to remaining performance obligations 118  
Later than 1 year    
Contract liabilities    
Transaction price allocated to remaining performance obligations 2  
Current contract liabilities    
Contract liabilities    
Long-term portion 1 0
Short-term portion 143 121
Total 144 121
Long-term portion    
Contract Assets [Line Items]    
Contract assets, net 27 21
Short-term portion    
Contract Assets [Line Items]    
Contract assets, net 65 59
Less: provisions for expected credit losses    
Contract Assets [Line Items]    
Contract assets, net $ (4) $ (3)