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Accumulated Other Comprehensive Income (Loss) (Detail) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance at December 31, 2013 $ (285)
Reclassifications to Consolidated Statement of Income 12
Balance at June 30, 2014 (273)
Interest-rate Derivatives Previously Subject to Hedge Accounting [Member]
 
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance at December 31, 2013 (54)
Reclassifications to Consolidated Statement of Income 3
Balance at June 30, 2014 (51)
Pension and Other Postretirement Plans [Member]
 
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Balance at December 31, 2013 (231)
Reclassifications to Consolidated Statement of Income 9
Balance at June 30, 2014 $ (222)