Segment Information - Revenues By Geographic Area (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 United States	Dec. 31, 2012 United States	Dec. 31, 2011 United States	Dec. 31, 2013 Europe, Middle East and Africa	Dec. 31, 2012 Europe, Middle East and Africa	Dec. 31, 2011 Europe, Middle East and Africa	Dec. 31, 2013 Asia Pacific and Japan	Dec. 31, 2012 Asia Pacific and Japan	Dec. 31, 2011 Asia Pacific and Japan	Dec. 31, 2013 Latin America, Mexico and Canada	Dec. 31, 2012 Latin America, Mexico and Canada	Dec. 31, 2011 Latin America, Mexico and Canada	Dec. 31, 2013 Geographic Concentration Risk Revenues Country	Dec. 31, 2011 Geographic Concentration Risk Revenues Country	Dec. 31, 2010 Geographic Concentration Risk Revenues Country
Segment Reporting Information [Line Items]
Concentration Risk, Geographic, Number of Countries Other Than United States																								0	0	0
Total consolidated revenues	$ 6,682	$ 5,539	$ 5,614	$ 5,387	$ 6,030	$ 5,278	$ 5,311	$ 5,094	$ 23,222	$ 21,714	$ 20,008	$ 12,230	$ 11,510	$ 10,550	$ 6,355	$ 5,908	$ 5,668	$ 3,193	$ 3,017	$ 2,639	$ 1,444	$ 1,279	$ 1,151