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Accumulated Other Comprehensive Loss - Schedule of AOCI Components (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
AOCI Attributable to Parent, Net of Tax    
Beginning balance (net of tax effect) $ 12,530  
Ending balance (net of tax effect) 12,557  
AOCI beginning balance, tax effect (1,400) $ (1,458)
Changes in value, tax effect (2) 5
Reclassifications into retained earnings, tax effect (61)  
Reclassifications into earnings, tax effect 15 17
AOCI ending balance, tax effect (1,448) (1,446)
Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (net of tax effect) (7,621) (7,636)
Changes in value (net of tax effect) (7) 36
Reclassifications into retained earnings (net of tax effect) (106)  
Reclassifications into earnings (net of tax effect) 53 29
Ending balance (net of tax effect) (7,681) (7,571)
Pension and Other Benefits Liabilities    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (net of tax effect) (7,812) (7,714)
Changes in value (net of tax effect) 0 0
Reclassifications into retained earnings (net of tax effect) 0  
Reclassifications into earnings (net of tax effect) 51 41
Ending balance (net of tax effect) (7,761) (7,673)
Deferred income taxes related to pension obligation 700 700
Derivative Contracts and Other    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (net of tax effect) 85 114
Changes in value (net of tax effect) (7) (12)
Reclassifications into retained earnings (net of tax effect) 0  
Reclassifications into earnings (net of tax effect) 2 (4)
Ending balance (net of tax effect) 80 98
Available-for-Sale Investments    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (net of tax effect) 106 (36)
Changes in value (net of tax effect) 0 48
Reclassifications into retained earnings (net of tax effect) (106)  
Reclassifications into earnings (net of tax effect) 0 (8)
Ending balance (net of tax effect) $ 0 $ 4