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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ 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]      
Beginning balance $ 161,929 $ 160,242 $ 139,940
Components of Other Comprehensive Income (Loss):      
Other Comprehensive Gain (Loss), Net of Tax 200 (162) 1,091
Ending balance 153,157 161,929 160,242
Income tax expense (benefit) 9,757 8,173 14,066
Total      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (2,960) (2,798) (3,889)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications 0 (401) 729
Reclassifications 200 239 362
Other Comprehensive Gain (Loss), Net of Tax 200 (162) 1,091
Ending balance (2,760) (2,960) (2,798)
Currency Translation Adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (192) (203) (162)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (67) 11 (41)
Reclassifications 0 0 0
Other Comprehensive Gain (Loss), Net of Tax (67) 11 (41)
Ending balance (259) (192) (203)
Unrealized Holding Gains (Losses) on Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (11) (12) (11)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (8) 1 (1)
Reclassifications 0 0 0
Other Comprehensive Gain (Loss), Net of Tax (8) 1 (1)
Ending balance (19) (11) (12)
Derivatives      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance 5 (12) 0
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (44) (16) 68
Reclassifications 25 33 (80)
Other Comprehensive Gain (Loss), Net of Tax (19) 17 (12)
Ending balance (14) 5 (12)
Defined Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Beginning balance (2,762) (2,571) (3,716)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications 119 (397) 703
Reclassifications 175 206 442
Other Comprehensive Gain (Loss), Net of Tax 294 (191) 1,145
Ending balance (2,468) $ (2,762) $ (2,571)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income      
Components of Other Comprehensive Income (Loss):      
Reclassification, before tax amount 237    
Income tax expense (benefit) $ 62