Accrued Expenses

12 Months Ended

Dec. 31, 2017

Payables And Accruals [Abstract]

Accrued Expenses

10. Accrued Expenses

	December 31,
(in millions)	2017		2016
Compensation, including bonuses, fringe benefits and payroll taxes	$	656	$	610
Restructuring		84		102
Interest		45		42
Client contract related		565		502
Professional fees		76		69
Contingent consideration and deferred purchase price		59		22
Other		179		146
	$	1,664	$	1,493