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Investments (Additional Information) (Detail) (USD $)
 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
RS Cogen L LC
Dec. 31, 2012
Corporate Joint Venture
Dec. 31, 2012
Investments In Other Operating Joint Ventures
Apr. 30, 2011
Pittsburgh Glass Works LLC
Dec. 31, 2012
Pittsburgh Glass Works LLC
Dec. 31, 2011
Pittsburgh Glass Works LLC
Jul. 31, 2012
Asian Paints Ltd.
Schedule of Investment Income, Reported Amounts, by Category [Line Items]                    
Equity In Undistributed Earnings Losses Of Subsidiaries $ 79,000,000 $ 101,000,000                
Percent of ownership interest       50.00%   50.00%        
Noncontrolling interest in the new company               40.00%    
Carrying value of investment               33,000,000 29,000,000  
Proceed from repayment of notes receivable             168,000,000      
Repayment of notes receivable from related parties 0 90,000,000 0       90,000,000      
Return of capital, equity affiliate 0 78,000,000 0       78,000,000      
Investments in joint venture, fair value of tangible assets including goodwill                   22,000,000
Investments in joint venture, fair value of intangible assets                   12,000,000
Noncontrolling interest in joint ventures                   49,000,000
Construction and operation cost of process steam, natural gas-fired cogeneration facility in Lake Charles         300,000,000          
Future commitment to purchase electricity and steam in year one 23,000,000                  
Future commitment to purchase electricity and steam in year two 23,000,000                  
Future commitment to purchase electricity and steam in year three 23,000,000                  
Future commitment to purchase electricity and steam in year four 23,000,000                  
Future commitment to purchase electricity and steam in year five 23,000,000                  
Future commitment to purchase electricity and steam there after, per year 23,000,000                  
Contract term P10Y                  
Purchase electricity and steam 25,000,000 23,000,000 23,000,000              
Dividends received from equity affiliates 12,000,000 19,000,000 6,000,000              
Unrealized pretax gains (losses) 0 0                
Recognition of pretax gains 0 3,000,000 2,000,000              
Proceeds from sale investments $ 0 $ 9,000,000 $ 3,000,000