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Accumulated Other Comprehensive Loss - Schedule of AOCI Components (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Components of accumulated other comprehensive loss    
Beginning balance $ 13,687 $ 12,530
Ending balance 15,068 13,491
AOCI beginning balance, tax effect (1,492) (1,400)
Changes in value, tax effect (2) 6
Reclassifications into retained earnings, tax effect   (61)
Reclassifications into earnings, tax effect 57 51
AOCI ending balance, tax effect (1,437) (1,404)
Accumulated Other Comprehensive Income    
Components of accumulated other comprehensive loss    
Beginning balance (7,825) (7,621)
Changes in value (net of tax effect) (8) 20
Reclassifications into retained earnings (net of tax effect)   (106)
Reclassifications into earnings (net of tax effect) 188 172
Ending balance (7,645) (7,535)
Pension and Other Benefit Liabilities    
Components of accumulated other comprehensive loss    
Beginning balance (7,925) (7,812)
Changes in value (net of tax effect) (12) 13
Reclassifications into retained earnings (net of tax effect)   0
Reclassifications into earnings (net of tax effect) 189 164
Ending balance (7,748) (7,635)
Deferred income taxes related to pension obligation 688 688
Derivative Contracts and Other    
Components of accumulated other comprehensive loss    
Beginning balance 100  
Changes in value (net of tax effect) 4  
Reclassifications into earnings (net of tax effect) (1)  
Ending balance 103  
Derivative Contracts and Other    
Components of accumulated other comprehensive loss    
Beginning balance   85
Changes in value (net of tax effect)   7
Reclassifications into retained earnings (net of tax effect)   0
Reclassifications into earnings (net of tax effect)   8
Ending balance   100
Available-for-Sale Investments    
Components of accumulated other comprehensive loss    
Beginning balance 0 106
Changes in value (net of tax effect) 0 0
Reclassifications into retained earnings (net of tax effect)   (106)
Reclassifications into earnings (net of tax effect) 0 0
Ending balance $ 0 $ 0