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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) (Parenthetical) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) [Abstract]    
Gross billings$ 2,835$ 2,444$ 8,454$ 7,274
Worksite employee payroll cost$ 2,363$ 2,030$ 6,973$ 5,990