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Shareowners' Equity and Noncontrolling Interest (Summary of Changes in AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (8,333) $ (7,344) $ (8,334) $ (7,619)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation 146 39    
Amounts reclassified, pretax - Foreign Currency Translation 0 (1)    
Tax reclassified - Foreign Currency Translation 0 0    
Other comprehensive (loss) income before reclassifications, net - Pension 0 17    
Amounts reclassified, pretax - Pension 131 126    
Tax reclassified - Pension 48 46    
Other comprehensive (loss) income before reclassifications, net - AFS Securities (21) 38    
Amounts reclassified, pretax - AFS Securities 383 27    
Tax reclassified - AFS Securities 147 12    
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains 50 117    
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains (5) (62)    
Tax reclassified - Unrealized Hedging (Losses) Gains (1) (17)    
Other comprehensive (loss) income before reclassifications, net 150 164    
Amounts reclassified, pretax 247 (162)    
Tax reclassified 98 (51)    
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (3,359) (2,411) (3,480) (2,438)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (4,962) (5,072) (5,045) (5,135)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax 96 316 353 293
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated Other Comprehensive Income (Loss), Net of Tax (108) (177) $ (162) $ (339)
Parent [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation 121 $ 26    
Investments in Watsco, Inc.        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains $ 380