Revenues By Geographic Area (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 5,614	$ 5,311	$ 11,001	$ 10,406
United States
Segment Reporting Information [Line Items]
Total consolidated revenues	2,963	2,857	5,795	5,490
Europe, Middle East and Africa
Segment Reporting Information [Line Items]
Total consolidated revenues	1,486	1,400	2,963	2,865
Asia Pacific And Japan
Segment Reporting Information [Line Items]
Total consolidated revenues	835	748	1,573	1,459
Latin America, Mexico And Canada
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 330	$ 306	$ 670	$ 592