Business Combinations and Divestitures - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended	7 Months Ended	12 Months Ended				7 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010 Eclipsys	Dec. 31, 2012 Eclipsys	Dec. 31, 2011 Eclipsys	May 31, 2010 Eclipsys	Aug. 24, 2010 Eclipsys	Dec. 31, 2010 Eclipsys Pro Forma Adjustment	Jun. 30, 2010 Eclipsys Pro Forma Adjustment	May 31, 2010 Eclipsys Pro Forma Adjustment
Business Acquisition [Line Items]
Merger, stock conversion ratio						1.2
Acquisition and integration-related costs		$ 57	$ 4	$ 36	$ 4		$ 15		$ 14
Goodwill adjustment related to tax liabilities	2
Net increase in revenue							80	522
Net increase in net income							3	15
Increase in revenue							27
Decrease in revenue									2
Increase to amortization expense							1		21
Increase to interest expense							3		22
Increase (decrease) in stock-based compensation expense							0		7
Increase (decrease) in operating expenses							$ (72)
Assumed effective income tax rate							39.00%