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Shareholders' Equity - Schedule of Noncontrolling Interest (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Beginning balance $ 794 $ 670 $ 979
Contribution of noncontrolling interest   765  
Comprehensive income (loss):      
Net income (loss) (629) (2,188) 155
Unrealized gains (losses) on derivatives, net of tax 7 89 (125)
Other comprehensive income (loss), net of tax 185 140 (335)
Comprehensive income (loss) (444) (2,048) (180)
Dividends to noncontrolling interest (4) (5) (5)
Ending balance 1,042 794 670
Noncontrolling Interest [Member]
      
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Beginning balance 139 393 9
Joint ventures deconsolidation 73    
Contribution of noncontrolling interest   765  
Comprehensive income (loss):      
Net income (loss) (129) (1,030) (495)
Unrealized gains (losses) on derivatives, net of tax (3) 10 (10)
Other components of other comprehensive income (loss), net of tax (2) 6 (16)
Other comprehensive income (loss), net of tax (5) 16 (26)
Comprehensive income (loss) (134) (1,014) (521)
Dividends to noncontrolling interest (4) (5) (5)
Ending balance $ 74 $ 139 $ 393