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Accumulated Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax      
Beginning balance $ 13,687 $ 12,530 $ 11,279
Changes in value (net of tax effect) (415) (287) (137)
Changes in value, tax effect (133) (88) (32)
Reclassifications into retained earnings (net of tax effect)   (106)  
Reclassifications into retained earnings, tax effect   (61)  
Reclassification into earnings (net of tax effect) 251 189 152
Reclassifications into earnings, tax effect 76 57 90
Ending balance 15,358 13,687 12,530
Deferred income taxes related to pension obligation 672    
Accumulated Other Comprehensive Income      
AOCI Attributable to Parent, Net of Tax      
Beginning balance (7,825) (7,621) (7,636)
Beginning balance, tax effect (1,492) (1,400) (1,458)
Ending balance (7,989) (7,825) (7,621)
Ending balance, tax effect (1,549) (1,492) (1,400)
Pension and Other Benefits Liabilities      
AOCI Attributable to Parent, Net of Tax      
Beginning balance (7,925) (7,812) (7,714)
Changes in value (net of tax effect) (422) (294) (264)
Reclassifications into retained earnings (net of tax effect)   0  
Reclassification into earnings (net of tax effect) 252 181 166
Ending balance (8,095) (7,925) (7,812)
Derivative Contracts and Other      
AOCI Attributable to Parent, Net of Tax      
Beginning balance 100 85 114
Changes in value (net of tax effect) 7 7 (23)
Reclassifications into retained earnings (net of tax effect)   0  
Reclassification into earnings (net of tax effect) (1) 8 (6)
Ending balance 106 100 85
Available-for-Sale Investments(3)      
AOCI Attributable to Parent, Net of Tax      
Beginning balance 0 106 (36)
Changes in value (net of tax effect) 0 0 150
Reclassifications into retained earnings (net of tax effect)   (106)  
Reclassification into earnings (net of tax effect) 0 0 (8)
Ending balance $ 0 $ 0 $ 106