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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 $ 132,726 $ 145,208 $ 155,642
Components of Other Comprehensive Income (Loss):      
Before Reclassifications 887 (1,454) (1,855)
Reclassifications 836 832 409
Other Comprehensive Gain (Loss), Net of Tax 1,723 (622) (1,446)
Balance at December 31 139,940 132,726 145,208
Income tax expense (benefit) 5,950 (1,892) 2,691
Currency Translation Adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 (107) (142) (124)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (55) 35 (18)
Reclassifications 0 0 0
Other Comprehensive Gain (Loss), Net of Tax (55) 35 (18)
Balance at December 31 (162) (107) (142)
Unrealized Holding Gains (Losses) on Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 (10) (8) (10)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (1) (2) 2
Reclassifications 0 0 0
Other Comprehensive Gain (Loss), Net of Tax (1) (2) 2
Balance at December 31 (11) (10) (8)
Derivatives      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 0 0 (2)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (6) 0 (1)
Reclassifications 6 0 3
Other Comprehensive Gain (Loss), Net of Tax 0 0 2
Balance at December 31 0 0 0
Defined Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 (5,495) (4,840) (3,408)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications 949 (1,487) (1,838)
Reclassifications 830 832 406
Other Comprehensive Gain (Loss), Net of Tax 1,779 (655) (1,432)
Balance at December 31 (3,716) (5,495) (4,840)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income      
Components of Other Comprehensive Income (Loss):      
Reclassification, before tax amount 1,055    
Income tax expense (benefit) 225    
Accumulated Other Comprehensive Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 (5,612) (4,990) (3,544)
Components of Other Comprehensive Income (Loss):      
Other Comprehensive Gain (Loss), Net of Tax 1,723 (622) (1,446)
Balance at December 31 $ (3,889) $ (5,612) $ (4,990)