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Accumulated Other Comprehensive Loss - Schedule of AOCI Components (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
AOCI Attributable to Parent, Net of Tax    
Beginning balance $ 12,287  
Ending balance 13,479  
Accumulated other comprehensive loss, tax portion, beginning balance 1,458 $ 1,222
Other comprehensive income, tax affect 6 42
Reclassification into earnings, tax effect 40 29
Accumulated other comprehensive loss, tax portion, ending balance 1,424 1,235
Accumulated Other Comprehensive Income    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (7,636) (7,275)
Changes in value (net of tax effect) 18 (53)
Reclassifications into earnings (net of tax effect) 69 49
Ending balance (7,549) (7,279)
Pension and Other Benefits Liabilities    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (7,714) (7,354)
Changes in value (net of tax effect) 0 0
Reclassifications into earnings (net of tax effect) 83 72
Ending balance (7,631) (7,282)
Deferred income taxes related to pension obligation 1,900 1,900
Derivative Contracts    
AOCI Attributable to Parent, Net of Tax    
Beginning balance 97 140
Changes in value (net of tax effect) (14) (69)
Reclassifications into earnings (net of tax effect) (7) (23)
Ending balance 76 48
Investments    
AOCI Attributable to Parent, Net of Tax    
Beginning balance (19) (61)
Changes in value (net of tax effect) 32 16
Reclassifications into earnings (net of tax effect) (7) 0
Ending balance $ 6 $ (45)