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Changes in Accumulated Other Comprehensive Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 $ 145,208 $ 155,642 $ 149,319
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (1,454) (1,855) 4
Reclassifications 832 409 603
Other Comprehensive Gain (Loss), Net of Tax (622) (1,446) 607
Stranded Tax Reclassification to Retained Earnings     (562)
Balance at December 31 132,726 145,208 155,642
Income tax expense (benefit) (1,892) 2,691 5,715
Currency Translation Adjustments      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 (142) (124) (105)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications 35 (18) (19)
Reclassifications 0 0 0
Other Comprehensive Gain (Loss), Net of Tax 35 (18) (19)
Stranded Tax Reclassification to Retained Earnings     0
Balance at December 31 (107) (142) (124)
Unrealized Holding Gains (Losses) on Securities      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 (8) (10) (5)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (2) 2 (5)
Reclassifications 0 0 0
Other Comprehensive Gain (Loss), Net of Tax (2) 2 (5)
Stranded Tax Reclassification to Retained Earnings     0
Balance at December 31 (10) (8) (10)
Derivatives      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 0 (2) (2)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications 0 (1) 0
Reclassifications 0 3 0
Other Comprehensive Gain (Loss), Net of Tax 0 2 0
Stranded Tax Reclassification to Retained Earnings     0
Balance at December 31 0 0 (2)
Defined Benefit Plans      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 (4,840) (3,408) (3,477)
Components of Other Comprehensive Income (Loss):      
Before Reclassifications (1,487) (1,838) 28
Reclassifications 832 406 603
Other Comprehensive Gain (Loss), Net of Tax (655) (1,432) 631
Stranded Tax Reclassification to Retained Earnings     (562)
Balance at December 31 (5,495) (4,840) (3,408)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income      
Components of Other Comprehensive Income (Loss):      
Reclassification, before tax amount 1,084    
Income tax expense (benefit) 252    
Accumulated Other Comprehensive Loss      
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]      
Balance at January 1 (4,990) (3,544) (3,589)
Components of Other Comprehensive Income (Loss):      
Other Comprehensive Gain (Loss), Net of Tax (622) (1,446) 607
Balance at December 31 $ (5,612) $ (4,990) $ (3,544)