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Cash Flow Information - Schedule of Cash Paid for Interest and Income Taxes (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Statement of Cash Flows [Abstract]      
Interest, net of amount capitalized $ 441us-gaap_InterestPaidNet $ 433us-gaap_InterestPaidNet $ 454us-gaap_InterestPaidNet
Income taxes, net of amount refunded $ 301us-gaap_IncomeTaxesPaidNet $ 200us-gaap_IncomeTaxesPaidNet $ 223us-gaap_IncomeTaxesPaidNet