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Accumulated Other Comprehensive Loss (Summary of Changes in AOCI) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Jun. 30, 2020
Dec. 31, 2019
Jun. 30, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (8,012) $ (10,819) $ (8,012) $ (10,819) $ (8,800) $ (10,149) $ (9,892) $ (9,333)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation 605 (417) (175) (322)        
Amounts reclassified, pretax - Foreign Currency Translation 0 0 0 0        
Tax benefit (expense) - Foreign Currency Translation 7 (56) 19 (55)        
Other Comprehensive Income (Loss), Foreign Currency Transaction, Effect of Separation of Otis and Carrier     3,287          
ASU 2018-02 adoption impact - Foreign Currency Translation       (8)        
Other comprehensive (loss) income before reclassifications, net - Pension (12) (420) (2,375) (434)        
Amounts reclassified, pretax - Pension 95 (41) 282 46        
Tax benefit (expense) - Pension (22) 114 515 98        
Other Comprehensive Income (Loss), Defined Benefit Plan, Effect of Separation of Otis and Carrier     584          
ASU 2018-02 adoption impact - Pension       (737)        
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains 117 (153) (98) (125)        
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains 37 20 93 40        
Tax benefit (expense) - Unrealized Hedging (Losses) Gains (39) 26 1 11        
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives, Effect of Separation of Otis and Carrier     4          
ASU 2018-02 adoption impact - Unrealized Hedging (Losses) Gains       0        
Other comprehensive (loss) income before reclassifications, net 710 (990) (2,648) (881)        
Amounts reclassified, pre-tax 132 (21) 375 86        
Tax benefit (expense) (54) 84 535 54        
Other Comprehensive Income (Loss), Effect of Separation of Otis and Carrier     3,875          
ASU 2018-02 adoption impact       (745)        
Foreign Currency Translation                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (80) (3,827) (80) (3,827) (692) (3,211) (3,354) (3,442)
Defined Benefit Pension and Post-retirement Plans                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (7,766) (6,745) (7,766) (6,745) (7,827) (6,772) (6,398) (5,718)
Unrealized hedging (losses) gains                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (166) $ (247) $ (166) $ (247) $ (281) $ (166) $ (140) $ (173)