Goodwill - Schedule of Goodwill (Details) $ in Millions	Jun. 30, 2023 USD ($)
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, gross	$ 10,095
Accumulated impairment losses	(9,556)
GBS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, gross	5,029
Accumulated impairment losses	(4,490)
GIS
Changes in the carrying amount of goodwill by segment [Roll Forward]
Goodwill, gross	5,066
Accumulated impairment losses	$ (5,066)