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Stockholders' equity (Components of AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Mar. 31, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Increase (Decrease) in AOCI [Roll Forward]          
Balance as of beginning of period $ 5,348 $ 3,661 $ 916 $ 3,661 $ 6,700
Foreign currency translation adjustments 11   (65) 39 (116)
Balance as of end of period 6,781 5,348 2,419 6,781 2,419
Foreign currency translation          
Increase (Decrease) in AOCI [Roll Forward]          
Balance as of beginning of period (320) (348)   (348)  
Foreign currency translation adjustments 11 28      
Income taxes 0 0      
Balance as of end of period (309) (320)   (309)  
Cash flow hedges          
Increase (Decrease) in AOCI [Roll Forward]          
Balance as of beginning of period 42 128   128  
Unrealized losses 50 (71)      
Reclassification adjustments to income (87) (30)      
Income taxes 15 15      
Balance as of end of period 20 42   20  
Other          
Increase (Decrease) in AOCI [Roll Forward]          
Balance as of beginning of period 10 (11)   (11)  
Unrealized losses 0 0      
Other (1) 21      
Balance as of end of period 9 10   9  
AOCI          
Increase (Decrease) in AOCI [Roll Forward]          
Balance as of beginning of period (268) (231) (763) (231) (796)
Foreign currency translation adjustments 11 28      
Unrealized losses 50 (71)      
Reclassification adjustments to income (87) (30)      
Other (1) 21      
Income taxes 15 15      
Balance as of end of period $ (280) $ (268) $ (672) $ (280) $ (672)