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Segment and Geographic Area Information - Schedule of Reconciliation of Certain Segment Information to Consolidated Totals (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Consolidated sales $ 6,377us-gaap_SalesRevenueGoodsNet $ 6,239us-gaap_SalesRevenueGoodsNet $ 5,836us-gaap_SalesRevenueGoodsNet $ 5,454us-gaap_SalesRevenueGoodsNet $ 5,585us-gaap_SalesRevenueGoodsNet $ 5,765us-gaap_SalesRevenueGoodsNet $ 5,849us-gaap_SalesRevenueGoodsNet $ 5,833us-gaap_SalesRevenueGoodsNet $ 23,906us-gaap_SalesRevenueGoodsNet $ 23,032us-gaap_SalesRevenueGoodsNet $ 23,700us-gaap_SalesRevenueGoodsNet
Operating Segments [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Consolidated sales                 28,723us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
27,795us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
28,777us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
Intersegment Eliminations [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Consolidated sales                 (5,057)us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
(5,034)us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
(5,350)us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_IntersegmentEliminationMember
Corporate [Member]                      
Segment Reporting, Revenue Reconciling Item [Line Items]                      
Consolidated sales                 $ 240us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
$ 271us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
$ 273us-gaap_SalesRevenueGoodsNet
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember