Goodwill and Acquired Intangible Assets (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
Goodwill [Line Items]
Goodwill, Impaired, Accumulated Impairment Loss			$ 0
Goodwill [Roll Forward]
Goodwill, beginning	1,886	1,914
Goodwill, Acquired During Period	314	(4)
Goodwill, impairment loss	0	(24)	0
Goodwill, ending	2,200	1,886	1,914
Financial management solutions [Member]
Goodwill [Roll Forward]
Goodwill, beginning	151	151
Goodwill, Acquired During Period	316	0
Goodwill, impairment loss		0
Goodwill, ending	467	151
Employee management solutions [Member]
Goodwill [Roll Forward]
Goodwill, beginning	271	271
Goodwill, Acquired During Period	0	0
Goodwill, impairment loss		0
Goodwill, ending	271	271
Payment solutions [Member]
Goodwill [Roll Forward]
Goodwill, beginning	182	182
Goodwill, Acquired During Period	9	0
Goodwill, impairment loss		0
Goodwill, ending	191	182
Consumer tax [Member]
Goodwill [Roll Forward]
Goodwill, beginning	30	30
Goodwill, Acquired During Period	0	0
Goodwill, impairment loss		0
Goodwill, ending	30	30
Accounting professionals [Member]
Goodwill [Roll Forward]
Goodwill, beginning	90	90
Goodwill, Acquired During Period	0	0
Goodwill, impairment loss		0
Goodwill, ending	90	90
Financial services [Member]
Goodwill [Roll Forward]
Goodwill, beginning	1,005	1,009
Goodwill, Acquired During Period	(11)	(4)
Goodwill, impairment loss		0
Goodwill, ending	994	1,005
Other businesses [Member]
Goodwill [Roll Forward]
Goodwill, beginning	157	181
Goodwill, Acquired During Period	0	0
Goodwill, impairment loss		(24)
Goodwill, ending	$ 157	$ 157