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Accumulated Other Comprehensive Loss - Schedule of AOCI Components (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Components of accumulated other comprehensive loss    
Beginning balance $ 15,358 $ 13,687
Beginning balance, tax effect   1,492
Changes in value (net of tax effect) 21 (2)
Changes in value, tax effect (3) 1
Reclassifications into earnings (net of tax effect) 70 61
Reclassifications into earnings, tax effect 21 19
Ending balance 14,309 12,911
Ending balance, tax effect   1,474
Accumulated Other Comprehensive Income    
Components of accumulated other comprehensive loss    
Beginning balance (7,989) (7,825)
Beginning balance, tax effect 1,549  
Ending balance (7,898) (7,766)
Ending balance, tax effect 1,531  
Pension and Other Benefit Liabilities    
Components of accumulated other comprehensive loss    
Beginning balance (8,095) (7,925)
Changes in value (net of tax effect) 0 0
Reclassifications into earnings (net of tax effect) 70 60
Ending balance (8,025) (7,865)
Deferred income taxes related to pension obligation 672  
Other    
Components of accumulated other comprehensive loss    
Beginning balance 106 100
Changes in value (net of tax effect) 21 (2)
Reclassifications into earnings (net of tax effect) 0 1
Ending balance $ 127 $ 99