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Employee Benefit Plans (Pension Plans) (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 26, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Document Fiscal Year Focus | 2019 |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 41,300 | $ 37,000 |  |
Payment for Pension Benefits | 118 | 147 | $ 2,112 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change | (93) | 105 | (116) |
Research and development | 3,015 | 2,462 | 2,427 |
Selling, general and administrative | 8,521 | 7,066 | 6,429 |
Other Income | 521 | 1,565 | 1,358 |
Non-service pension cost (benefit) | (888) | (765) | (534) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (525) | (393) | (158) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (525) | (393) | (158) |
Product [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Cost of Goods and Services Sold | 42,444 | 36,754 | 31,224 |
Service [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Cost of Goods and Services Sold | 14,621 | 13,231 | 12,977 |
Previously Reported [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Research and development |  |  | 2,387 |
Selling, general and administrative |  |  | 6,183 |
Non-service pension cost (benefit) |  |  | 0 |
Previously Reported [Member] | Product [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Cost of Goods and Services Sold |  |  | 31,027 |
Previously Reported [Member] | Service [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Cost of Goods and Services Sold |  |  | 12,926 |
Accounting Standards Update 2017-07 [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Research and development |  |  | 40 |
Selling, general and administrative |  |  | 246 |
Non-service pension cost (benefit) |  |  | (534) |
Accounting Standards Update 2017-07 [Member] | Product [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Cost of Goods and Services Sold |  |  | 197 |
Accounting Standards Update 2017-07 [Member] | Service [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Cost of Goods and Services Sold |  |  | 51 |
Foreign Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment for Pension Benefits | 93 | $ 147 |  |
Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Payment for Pension Benefits | $ 25 |  | $ 1,900 |
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Percentage Of Projected Benefit Obligation Comprised Of Domestic Plan Benefits | 75.00% |  |  |
Percentage Of Projected Benefit Obligation Comprised Of Foreign Plan Benefits | 24.00% |  |  |
Range Of Growth Seeking Assets In Company's Overall Investment Strategy | 45% to 50 |  |  |
Range Of Income Generating Assets In Company's Overall Investment Strategy | 50% to 55 |  |  |
Pecentage Of Interest Rate Sensitivity Of Pension Plan Liabilities Fixed Income Portfolio Designed To Hedge | 65% to 70 |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 6.70% | 6.80% | 7.30% |
Defined Benefit Plan Common Stock Funded Percentage | 1.00% |  |  |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Other Change | $ 127 | $ (434) |  |
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year | 125 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | 2,428 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 2,230 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 2,263 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 2,289 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 2,303 |  |  |
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter | 11,597 |  |  |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation | 39,267 | 25,884 |  |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | 38,816 | 25,455 |  |
Actuarial loss (gain) | 4,651 | (2,048) |  |
Net settlement and curtailment gain (loss) | 54 | (1) | $ (3) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | (503) | (405) | (179) |
Actuarial loss (gain) | 4,651 | (2,048) |  |
Net settlement and curtailment gain (loss) | 54 | (1) | (3) |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ (503) | $ (405) | $ (179) |
Pension Plan [Member] | Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 6.50% | 7.00% |  |
Pension Plan [Member] | UNITED STATES |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actuarial loss (gain) | $ (425) |  |  |
Net settlement and curtailment gain (loss) | 98 |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 39 |  |  |
Defined Benefit Plan Actuarial Gain | 180 |  |  |
Actuarial loss (gain) | (425) |  |  |
Net settlement and curtailment gain (loss) | 98 |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 39 |  |  |
Pension Plan [Member] | UNITED STATES | Remeasurement loss [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Actuarial loss (gain) | (605) |  |  |
Actuarial loss (gain) | $ (605) |  |  |
Rockwell Collins [Member] | Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, liability, pension projected benefit obligation |  |  |  | $ 3,700
Business combination, recognized identifiable assets acquired and liabilities assumed, asset, pension plan assets |  |  |  | $ 3,400

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