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Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance $ (831) $ (1,079)
Changes in value (37) (68) [1]
Amounts reclassified to earnings 91 170 [1]
Comprehensive income (loss) adjustments 54 102
Ending Balance (777) (977)
Pension and Other Postretirement Liabilities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (363) (472)
Changes in value (43) (8) [1]
Amounts reclassified to earnings 5 10 [1]
Comprehensive income (loss) adjustments (38) 2
Ending Balance (401) (470)
Derivative Contracts    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (215) (499)
Changes in value (16) (75) [1]
Amounts reclassified to earnings 138 161 [1]
Comprehensive income (loss) adjustments 122 86
Ending Balance (93) (413)
Investments and Other    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance 3 7
Changes in value [1]   15
Amounts reclassified to earnings [1]   (1)
Comprehensive income (loss) adjustments   14
Ending Balance 3 21
Pension and Other Postretirement Deferred Taxes    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (154) (115)
Changes in value 16  
Amounts reclassified to earnings (2)  
Comprehensive income (loss) adjustments 14  
Ending Balance (140) $ (115)
Derivative Contracts Deferred Taxes    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning Balance (102)  
Changes in value 6  
Amounts reclassified to earnings (50)  
Comprehensive income (loss) adjustments (44)  
Ending Balance $ (146)  
[1] Income tax expense for these items was offset by the Company's valuation allowance.