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Changes in Accumulated Other Comprehensive Losses - Summary of Changed (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at January 1   $ 149,319 $ 146,722 $ 153,886
Components of Other Comprehensive Income (Loss):        
Before Reclassifications   4 (256) (156)
Reclassifications   603 510 604
Other Comprehensive Gain, Net of Tax   607 254 448
Stranded Tax Reclassification to Retained Earnings $ 562 (562)    
Balance at December 31 155,642 155,642 149,319 146,722
Income tax expense (benefit)   5,715 (48) (1,729)
Currency Translation Adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at January 1   (105) (162) (140)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications   (19) 57 (22)
Reclassifications   0 0 0
Other Comprehensive Gain, Net of Tax   (19) 57 (22)
Stranded Tax Reclassification to Retained Earnings   0    
Balance at December 31 (124) (124) (105) (162)
Unrealized Holding Gains (Losses) on Securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at January 1   (5) (2) (29)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications   (5) (3) 27
Reclassifications   0 0 0
Other Comprehensive Gain, Net of Tax   (5) (3) 27
Stranded Tax Reclassification to Retained Earnings   0    
Balance at December 31 (10) (10) (5) (2)
Derivatives        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at January 1   (2) (2) (2)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications   0 0 0
Reclassifications   0 0 0
Other Comprehensive Gain, Net of Tax   0 0 0
Stranded Tax Reclassification to Retained Earnings   0    
Balance at December 31 (2) (2) (2) (2)
Defined Benefit Plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at January 1   (3,477) (3,677) (4,120)
Components of Other Comprehensive Income (Loss):        
Before Reclassifications   28 (310) (161)
Reclassifications   603 510 604
Other Comprehensive Gain, Net of Tax   631 200 443
Stranded Tax Reclassification to Retained Earnings   (562)    
Balance at December 31 (3,408) (3,408) (3,477) (3,677)
Defined Benefit Plans | Reclassification out of Accumulated Other Comprehensive Income        
Components of Other Comprehensive Income (Loss):        
Reclassification, before tax amount   779    
Income tax expense (benefit)   176    
Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Balance at January 1   (3,589) (3,843) (4,291)
Components of Other Comprehensive Income (Loss):        
Other Comprehensive Gain, Net of Tax   607 254 448
Balance at December 31 $ (3,544) $ (3,544) $ (3,589) $ (3,843)