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Pension and Other Postretirement Benefits - Components of Net Periodic Benefit Cost (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]      
Net periodic benefit cost $ 261 $ 423 $ 335
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 155 175 166
Interest cost 431 577 630
Expected return on plan assets (677) (753) (782)
Recognized net actuarial loss 380 468 391
Amortization of prior service cost (benefit) 13 16 18
Settlements 19 16 26
Curtailments   9  
Special termination benefits 2 16  
Net periodic benefit cost 323 524 449
Discontinued operations 122 248 215
Net amount recognized in Statement of Consolidated Operations 201 276 234
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 13 14 15
Interest cost 63 92 114
Recognized net actuarial loss 24 17 13
Amortization of prior service cost (benefit) (24) (37) (25)
Curtailments   (4)  
Net periodic benefit cost 76 82 117
Discontinued operations 41 43 68
Net amount recognized in Statement of Consolidated Operations $ 35 $ 39 $ 49