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Derivatives and Hedging Instruments - Gain (Loss) on Derivatives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivative Instruments, Gain (Loss) [Line Items]        
(Gain) loss reclassified from AOCI $ 0 $ 24 $ 0 $ 43
Interest rate contracts | Cash Flow Hedging | Cost of services        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized 0 35 0 24
(Gain) loss reclassified from AOCI 0 (19) 0 (34)
Interest rate contracts | Cash Flow Hedging | Interest expense        
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized 0 0 0 0
(Gain) loss reclassified from AOCI $ 0 $ (5) $ 0 $ (9)