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Shareholders' Equity - Schedule of Noncontrolling Interest (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Changes in Noncontrolling Interest [Line Items]      
Beginning balance $ 670    
Business combination 765 9  
Comprehensive income (loss):      
Net income (loss) (1,158) 650 830
Unrealized gains (losses) on derivatives, net of tax 89 (125) 56
Other comprehensive income (loss), net of tax 140 (335) (196)
Comprehensive income (loss) (2,048) (180) 346
Dividends to noncontrolling interest (5) (5) (7)
Ending balance 794 670  
Noncontrolling Interest [Member]
      
Changes in Noncontrolling Interest [Line Items]      
Beginning balance 393 910 1,216
Contribution of noncontrolling interest 765    
Business combination 765 9  
Comprehensive income (loss):      
Net income (loss) (1,030) (495) (288)
Unrealized gains (losses) on derivatives, net of tax 10 (10) 2
Other components of other comprehensive income (loss), net of tax 6 (16) (13)
Other comprehensive income (loss), net of tax 16 (26) (11)
Comprehensive income (loss) (1,014) (521) (299)
Dividends to noncontrolling interest (5) (5) (7)
Ending balance $ 139 $ 393 $ 910