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Operating Income to Income from Continuing Operations Reconciliation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total operating income $ 1,258 $ 724 $ 449
Net interest expense 55 66 126
Other income, net (14) (4,296) (105)
Income from continuing operations before income taxes 1,217 4,954 428
Operating Segments      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total operating income 3,303 3,010 2,563
Corporate and Other      
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]      
Total operating income $ (2,045) $ (2,286) $ (2,114)