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Shareowners' Equity and Noncontrolling Interest (Summary of Changes in AOCI) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (7,684) $ (7,964) $ (7,684) $ (7,964) $ (6,937) $ (7,525) $ (8,333) $ (8,334)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation (602) 249 (193) 395        
Amounts reclassified, pretax - Foreign Currency Translation 3 0 3 0        
Tax (benefit) expense reclassified - Foreign Currency Translation (74) 0 56 0        
Other comprehensive (loss) income before reclassifications, net - Pension 18 (2) 26 (2)        
Amounts reclassified, pretax - Pension 88 132 176 263        
Tax (benefit) expense reclassified - Pension (26) (50) (49) (98)        
Other comprehensive (loss) income before reclassifications, net - AFS Securities 0 20 0 (1)        
Amounts reclassified, pretax - AFS Securities 0 24 0 407        
Tax (benefit) expense reclassified - AFS Securities 0 8 0 155        
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 (245) 50 (200) 100        
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains 1 (5) 28 (10)        
Tax (benefit) expense reclassified - Unrealized Hedging (Losses) Gains 60 (1) 56 (2)        
Other comprehensive (loss) income before reclassifications, net (791) 299 (362) 449        
Amounts reclassified, pretax (84) (113) (145) 134        
Tax (benefit) expense reclassified (40) (43) 63 55        
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 (3,085) (3,128) (3,085) (3,128) (2,444) (2,950) (3,359) (3,480)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation (564) 231 (188) 352        
Defined Benefit Pension and Post-retirement Plans                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (4,499) (4,882) (4,499) (4,882) (4,579) (4,652) (4,962) (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 0 100 0 100 0 5 96 353
Sales of significant investments in AFS securities [Member]                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains   380            
Unrealized hedging (losses) gains                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (100) $ (54) $ (100) $ (54) $ 86 $ 72 $ (108) $ (162)