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Stockholders' Equity - Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance $ 1,449 $ (776) $ 1,477
Other comprehensive loss before reclassifications (2,164) (606) (1,260)
Amounts reclassified from AOCL      
Amounts reclassified from AOCL 931 1,232 823
Other comprehensive income (loss), net of tax (1,233) 626 (437)
Ending Balance 3,171 1,449 (776)
Postretirement Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (14,254) (12,559) (11,981)
Other comprehensive loss before reclassifications (2,182) (501) (1,380)
Amounts reclassified from AOCL      
Amounts reclassified from AOCL 908 1,202 802
Other comprehensive income (loss), net of tax (1,274) 701 (578)
Reclassification of income tax effects from tax reform   (2,396)  
Ending Balance (15,528) (14,254) (12,559)
AOCI related to postretirement benefit plans, tax benefit 4,200 3,900 6,500
Other, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (67) 20 (121)
Other comprehensive loss before reclassifications 18 (105) 120
Amounts reclassified from AOCL      
Amounts reclassified from AOCL 23 30 21
Other comprehensive income (loss), net of tax 41 (75) 141
Reclassification of income tax effects from tax reform   (12)  
Ending Balance (26) (67) 20
AOCL      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning Balance (14,321) (12,539) (12,102)
Amounts reclassified from AOCL      
Other comprehensive income (loss), net of tax (1,233) 626 (437)
Reclassification of income tax effects from tax reform   (2,408)  
Ending Balance (15,554) (14,321) (12,539)
Recognition of net actuarial losses      
Amounts reclassified from AOCL      
Amounts reclassified from AOCL 1,148 1,455 1,030
Amortization of net prior service credits      
Amounts reclassified from AOCL      
Amounts reclassified from AOCL (240) (253) (228)
Other      
Amounts reclassified from AOCL      
Amounts reclassified from AOCL $ 23 $ 30 $ 21