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Accumulated Other Comprehensive Loss (Summary of Changes in AOCI) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (3,555) $ (8,800) $ (3,555) $ (8,800) $ (3,921) $ (3,734) $ (11,788) $ (10,149)
Other comprehensive (loss) income before reclassifications, net - Foreign Currency Translation 258 665 82 (780)        
Amounts reclassified, pretax - Foreign Currency Translation 0 0 0 0        
Tax benefit (expense) - Foreign Currency Translation 2 3 (3) 12        
Other Comprehensive Income (Loss), Foreign Currency Transaction, Effect of Separation of Otis and Carrier   3,287   3,287        
Other comprehensive (loss) income before reclassifications, net - Pension (14) (2,371) (24) (2,363)        
Amounts reclassified, pretax - Pension 64 85 128 187        
Tax benefit (expense) - Pension (11) 568 (23) 537        
Other Comprehensive Income (Loss), Defined Benefit Plan, Effect of Separation of Otis and Carrier   584   584        
Other comprehensive (loss) income before reclassifications, net - Unrealized Hedging (Losses) Gains 108 188 62 (215)        
Amounts reclassified, pretax - Unrealized Hedging (Losses) Gains (20) 27 (34) 56        
Tax benefit (expense) - Unrealized Hedging (Losses) Gains (21) (52) (9) 40        
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives, Effect of Separation of Otis and Carrier   4   4        
Other comprehensive (loss) income before reclassifications, net 352 (1,518) 120 (3,358)        
Amounts reclassified, pre-tax 44 112 94 243        
Tax benefit (expense) (30) 519 (35) 589        
Other Comprehensive Income (Loss), Effect of Separation of Otis and Carrier   3,875   3,875        
Foreign Currency Translation                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax 789 (692) 789 (692) 529 710 (4,647) (3,211)
Defined Benefit Pension and Post-retirement Plans                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax (4,402) (7,827) (4,402) (7,827) (4,441) (4,483) (6,693) (6,772)
Unrealized hedging (losses) gains                
Accumulated Other Comprehensive Income (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Net of Tax $ 58 $ (281) $ 58 $ (281) $ (9) $ 39 $ (448) $ (166)