Segment Information - Revenues By Geographic Area (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 6,032	$ 5,539	$ 17,391	$ 16,540
United States
Segment Reporting Information [Line Items]
Total consolidated revenues	3,212	2,956	9,102	8,752
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total consolidated revenues	1,672	1,455	4,933	4,418
Asia Pacific and Japan
Segment Reporting Information [Line Items]
Total consolidated revenues	821	789	2,346	2,361
Latin America, Mexico and Canada
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 327	$ 339	$ 1,010	$ 1,009