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Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]    
Interest expense $ 82us-gaap_InterestExpense $ 103us-gaap_InterestExpense
Operating Segments    
Segment Reporting Information [Line Items]    
Interest income 5us-gaap_InterestIncomeOperating
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 5us-gaap_InterestIncomeOperating
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Interest expense $ 6us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember		 $ 6us-gaap_InterestExpense
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember