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Income Taxes (Unrecognized Tax Benefits) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Examination [Line Items] |  |  |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 1,338 |  |
Balance at January 1 | 1,619 | $ 1,189 | $ 1,086
Additions for tax positions related to the current year | 131 | 192 | 192
Additions for tax positions of prior years | 73 | 344 | 73
Reductions for tax positions of prior years | 101 | 91 | 91
Settlements | 375 | 15 | 71
Balance at December 31 | 1,347 | 1,619 | 1,189
Gross interest expense related to unrecognized tax benefits | 57 | 37 | 34
Total accrued interest balance at December 31 | 249 | $ 255 | 215
Minimum [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 50 |  |
Maximum [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Decrease in Unrecognized Tax Benefits is Reasonably Possible | 650 |  |
IRS audit of 2014, 2015 and 2016 tax years |  |  |
Income Tax Examination [Line Items] |  |  |
Tax Settlement Gain (Loss) Noncash | 307 |  |
IRS audit of 2014, Rockwell Collins subsidiary |  |  |
Income Tax Examination [Line Items] |  |  |
Tax Settlement Gain (Loss) Noncash | 40 |  |
Reversal of indemnity asset |  |  |
Income Tax Examination [Line Items] |  |  |
Tax Settlement Gain (Loss) Noncash | (23) |  |
Various federal, state and non-US statute of limitations expirations and settlements [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Tax Settlement Gain (Loss) Noncash | 18 |  |
Closure of IRS audit of UTC Tax Year 2013 [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Tax Settlement Gain (Loss) Noncash |  |  | 64
Tax Settlement Interest Gain (Loss) Noncash |  |  | $ 9
Interest Income [Member] | IRS audit of 2014, Rockwell Collins subsidiary |  |  |
Income Tax Examination [Line Items] |  |  |
Tax Settlement Gain (Loss) Noncash | 56 |  |
Interest Income [Member] | Various federal, state and non-US statute of limitations expirations and settlements [Member] |  |  |
Income Tax Examination [Line Items] |  |  |
Tax Settlement Gain (Loss) Noncash | $ 5 |  |

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