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Stockholders' Equity - Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Other comprehensive (loss) income before reclassifications $ 236 $ (666) $ 1,714
Amounts reclassified from AOCL      
Amounts reclassified from AOCL 115 (114) 1,269
Other comprehensive income, net of tax 351 (780) 2,983
Non-cash, non-operating pension settlement charge     1,500
Non-cash, non-operating pension settlement charge, after tax     $ 1,200
Non-cash, non-operating pension settlement charge, per share, after tax (in dollars per share)     $ 4.33
Postretirement Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (8,704) (7,866) $ (10,964)
Other comprehensive (loss) income before reclassifications 340 (689) 1,873
Amounts reclassified from AOCL      
Amounts reclassified from AOCL 76 (149) 1,225
Other comprehensive income, net of tax 416 (838) 3,098
Ending balance (8,288) (8,704) (7,866)
AOCI related to postretirement benefit plans, tax benefit 2,200 2,300 2,100
Other, net      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (99) (157) (42)
Other comprehensive (loss) income before reclassifications (104) 23 (159)
Amounts reclassified from AOCL      
Amounts reclassified from AOCL 39 35 44
Other comprehensive income, net of tax (65) 58 (115)
Ending balance (164) (99) (157)
AOCL      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (8,803) (8,023) (11,006)
Amounts reclassified from AOCL      
Other comprehensive income, net of tax 351 (780) 2,983
Ending balance (8,452) (8,803) (8,023)
Recognition of settlement loss      
Amounts reclassified from AOCL      
Amounts reclassified from AOCL     1,156
Recognition of net actuarial losses      
Amounts reclassified from AOCL      
Amounts reclassified from AOCL 188 116 337
Amortization of net prior service credits      
Amounts reclassified from AOCL      
Amounts reclassified from AOCL (112) (265) (268)
Other      
Amounts reclassified from AOCL      
Amounts reclassified from AOCL $ 39 $ 35 $ 44