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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)

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