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Shareowners' Equity and Noncontrolling Interest (Summary of Changes in AOCI) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (7,723) $ (7,327) $ (7,723) $ (7,327) $ (7,684) $ (7,525) $ (7,964) $ (8,334)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation (185) 514 (378) 909        
Amounts reclassified, pretax - Foreign Currency Translation 0 3 3 3        
Tax (benefit) expense reclassified - Foreign Currency Translation 4 0 60 0        
Other comprehensive (loss) income before reclassifications, net - Pension (17) (37) 9 (39)        
Amounts reclassified, pretax - Pension 86 132 262 395        
Tax (benefit) expense reclassified - Pension (15) (66) (64) (164)        
Other comprehensive (loss) income before reclassifications, net - AFS Securities 0 12 0 11        
Amounts reclassified, pretax - AFS Securities 0 138 0 545        
Tax (benefit) expense reclassified - AFS Securities 0 50 0 205        
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on Securities Arising During Period 0 0 (5) 0        
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains 95 232 (105) 332        
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains (2) 24 26 14        
Tax (benefit) expense reclassified - Unrealized Hedging (Losses) Gains (28) 5 28 3        
Other comprehensive (loss) income before reclassifications, net (88) 681 (450) 1,130        
Amounts reclassified, pretax (88) 33 (233) 167        
Tax (benefit) expense reclassified (39) (11) 24 44        
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on foreign currency translation Arising During Period     0          
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on Defined Benefit Plan Arising During Period     0          
Other Comprehensive Income (Loss), ASU 2016-01 adoption impact on Derivatives Arising During Period     0          
Reclassification from OCI, current period, ASU 2016-01 adoption impact     (5)          
Foreign Currency Translation                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (3,247) (2,657) (3,247) (2,657) (3,085) (2,950) (3,128) (3,480)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation (166) 474 (354) 826        
Defined Benefit Pension and Post-retirement Plans                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (4,445) (4,853) (4,445) (4,853) (4,499) (4,652) (4,882) (5,045)
Unrealized Gains (Losses) on Available-for-Sale Securities                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax 0 24 0 24 0 5 100 353
Sales of significant investments in AFS securities [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains   500            
Unrealized hedging (losses) gains                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (31) $ 159 $ (31) $ 159 $ (100) $ 72 $ (54) $ (162)