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Segment Information - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting Information [Line Items]      
Revenue $ 48,580us-gaap_Revenues $ 45,266us-gaap_Revenues $ 41,731us-gaap_Revenues
United States      
Segment Reporting Information [Line Items]      
Revenue $ 14,000us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 $ 12,000us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US		 $ 11,800us-gaap_Revenues
/ us-gaap_StatementGeographicalAxis
= country_US
Sales Revenue, Segment      
Segment Reporting Information [Line Items]      
Maximum percentage of consolidated revenue customers 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember		 10.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueSegmentMember