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Employee Benefit Plans (Pension and Postretirement Plans) (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Nov. 26, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Document Fiscal Year Focus |  | 2019 |  |  |  |
Other |  | $ (93) | $ 105 | $ (116) |  |
Beginning Balance, Plan Assets |  | 35,253 |  |  |  |
Ending Balance, Plan Assets |  | 39,689 | 35,253 |  |  |
Noncurrent liability |  |  |  |  | $ 3,502 | $ 4,018
Payment for Pension Benefits |  | 118 | 147 | 2,112 |  |
Impact of change in estimation of NPPC |  | (525) | (393) | (158) |  |
Current year actuarial gain (loss) |  | (543) | (1,819) | 241 |  |
Current year prior service cost/credit |  | 6 | 22 | (2) |  |
Amortization of prior service credit |  | 228 | 344 | 529 |  |
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Beginning Balance, Benefit Obligation |  | 810 | 767 |  |  |
Service Cost |  | 2 | 2 | 2 |  |
Interest cost |  | 31 | 26 | 29 |  |
Actuarial loss (gain) |  | (11) | (52) |  |  |
Total benefits paid |  | 69 | 70 |  |  |
Defined Benefit Plan, Benefit Obligation, Business Combination |  | 0 | 186 |  |  |
Plan amendments | $ (43) | 0 | (43) |  |  |
Other |  | 2 | (6) |  |  |
Ending Balance, Benefit Obligation |  | 765 | 810 | 767 |  |
Beginning Balance, Plan Assets |  | 20 | 0 |  |  |
Employer Contributions |  | 69 | 69 |  |  |
Benefits Paid |  | 69 | 70 |  |  |
Defined Benefit Plan, Plan Assets, Business Combination |  | 0 | 20 |  |  |
Other |  | 0 | 1 |  |  |
Ending Balance, Plan Assets |  | 20 | 20 | 0 |  |
Benefit obligations |  | 810 | 810 | 767 | 765 | 810
Funded status of plan |  |  |  |  | (745) | (790)
Current liability |  |  |  |  | 47 | 61
Noncurrent liability |  |  |  |  | 698 | 729
Net amount recognized |  |  |  |  | (745) | (790)
Net actuarial gain (loss) |  |  |  |  | 181 | 184
Prior service credit |  |  |  |  | (4) | (47)
Net amount recognized |  |  |  |  | (185) | $ (231)
Expected return on plan assets |  | (1) | 0 | 0 |  |
Amortization of prior service credit |  | (42) | (6) | (1) |  |
Recognized actuarial net (gain) loss - in net periodic cost |  | (12) | (10) | (9) |  |
Impact of change in estimation of NPPC |  | (22) | $ 12 | $ 21 |  |
Current year actuarial gain (loss) |  | 10 |  |  |  |
Amortization of actuarial loss (gain) |  | (12) |  |  |  |
Amortization of prior service credit |  | (42) |  |  |  |
Other |  | 2 |  |  |  |
Total recognized in other comprehensive loss |  | 46 |  |  |  |
Net recognized in net periodic pension cost and other comprehensive loss |  | $ 24 |  |  |  |
Net actuarial (loss)/gain |  |  |  |  | 13 |
Prior service credit |  |  |  |  | $ (3) |
Discount rate, benefit obligation |  |  |  |  | 3.00% | 4.10%
Discount rate, net cost |  | 4.00% | 3.40% | 3.80% |  |
Health care cost trend rate assumed for next year |  |  |  |  | 6.50% | 7.00%
Rate that the cost trend rate gradually declines to |  |  |  |  | 5.00% | 5.00%
Year that the rate reaches the rate it is assumed to remain at |  | 2026 | 2026 |  |  |
Expected return on plan assets, net cost |  | 7.00% | 7.00% |  |  |
Effect on total service and interest cost - increase |  | $ 1 |  |  |  |
Effect on postretirement benefit obligation - increase |  | 25 |  |  |  |
Effect on total service and interest cost - decrease |  | 1 |  |  |  |
Effect on postretirement benefit obligation - decrease |  | 22 |  |  |  |
Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Beginning Balance, Benefit Obligation |  | 37,795 | $ 36,999 |  |  |
Service Cost |  | 359 | 372 | $ 374 |  |
Interest cost |  | 1,340 | 1,117 | 1,120 |  |
Actuarial loss (gain) |  | 4,651 | (2,048) |  |  |
Total benefits paid |  | 2,174 | 1,932 |  |  |
Net settlement, curtailment, and special termination benefits |  | 267 | 38 |  |  |
Defined Benefit Plan, Benefit Obligation, Business Combination |  | (6) | 3,694 |  |  |
Plan amendments |  | 6 | 65 |  |  |
Other |  | 127 | (434) |  |  |
Ending Balance, Benefit Obligation |  | 41,831 | 37,795 | 36,999 |  |
Beginning Balance, Plan Assets |  | 35,253 | 35,689 |  |  |
Actual return on plan assets |  | 6,311 | (1,667) |  |  |
Employer Contributions |  | 207 | 238 |  |  |
Benefits Paid |  | 2,174 | 1,932 |  |  |
Defined Benefit Plan, Plan Assets, Business Combination |  |  | 3,355 |  |  |
Settlements |  | 54 | 38 |  |  |
Other |  | 156 | (392) |  |  |
Ending Balance, Plan Assets |  | 39,689 | 35,253 | 35,689 |  |
Benefit obligations |  | 41,831 | 36,999 | 36,999 | $ 41,831 | $ 37,795
Funded status of plan |  |  |  |  | (2,142) | (2,542)
Noncurrent assets |  |  |  |  | 617 | 686
Current liability |  |  |  |  | 88 | 88
Noncurrent liability |  |  |  |  | 2,671 | 3,140
Net amount recognized |  |  |  |  | (2,142) | (2,542)
Net actuarial gain (loss) |  |  |  |  | (8,910) | (8,606)
Prior service credit |  |  |  |  | 203 | 139
Net amount recognized |  |  |  |  | 9,113 | $ 8,745
Expected return on plan assets |  | 2,430 | 2,255 | 2,215 |  |
Amortization of prior service credit |  | 17 | (41) | (36) |  |
Recognized actuarial net (gain) loss - in net periodic cost |  | 265 | 401 | 575 |  |
Impact of change in estimation of NPPC |  | (503) | (405) | (179) |  |
Net settlement and curtailment gain (loss) |  | 54 | $ (1) | $ (3) |  |
Current year actuarial gain (loss) |  | (553) |  |  |  |
Amortization of actuarial loss (gain) |  | 265 |  |  |  |
Current year prior service cost/credit |  | 6 |  |  |  |
Amortization of prior service credit |  | 17 |  |  |  |
Net settlement and curtailment loss |  | 57 |  |  |  |
Other |  | 34 |  |  |  |
Total recognized in other comprehensive loss |  | 368 |  |  |  |
Net recognized in net periodic pension cost and other comprehensive loss |  | $ (135) |  |  |  |
Net actuarial (loss)/gain |  |  |  |  | (371) |
Prior service credit |  |  |  |  | 51 |
Total amount to be amortized from AOCI to NPPC |  |  |  |  | $ 422 |
Salary scale, benefit obligation |  |  |  |  | 4.20% | 4.20%
Expected return on plan assets, benefit obligation |  |  |  |  | 0.00% | 0.00%
Salary scale, net cost |  | 4.20% | 4.20% | 4.10% |  |
Expected return on plan assets, net cost |  | 6.70% | 6.80% | 7.30% |  |
Fair value of plan assets |  |  |  |  | $ 36,530 | $ 22,803
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Projected Benefit Obligation |  |  |  |  | 39,680 | 28,591
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation |  |  |  |  | 39,178 | 27,968
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets |  |  |  |  | $ 36,921 | $ 25,362
Defined Benefit Plan, Plan Assets, Divestiture |  | $ 10 |  |  |  |
Pension Plan [Member] | UNITED STATES |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Actuarial loss (gain) |  | (425) |  |  |  |
Impact of change in estimation of NPPC |  | 39 |  |  |  |
Net settlement and curtailment gain (loss) |  | $ 98 |  |  |  |
PBO [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discount rate, benefit obligation |  |  |  |  | 3.00% | 4.00%
Discount rate, net cost |  | 3.90% | 3.40% | 3.80% |  |
Interest cost [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discount rate, benefit obligation |  |  |  |  | 0.00% | 0.00%
Discount rate, net cost |  | 3.60% | 3.00% | 3.30% |  |
Service cost [Member] | Pension Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Discount rate, benefit obligation |  |  |  |  | 0.00% | 0.00%
Discount rate, net cost |  | 3.60% | 3.30% | 3.60% |  |
Rockwell Collins [Member] | Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, liability, pension projected benefit obligation | 186 |  |  |  |  |
Business combination, recognized identifiable assets acquired and liabilities assumed, asset, pension plan assets | 20 |  |  |  |  |
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 |  |  |  |  |

X
- Definition This is focus fiscal year of the document report in CCYY format. For a 2006 annual report, which may also provide financial information from prior periods, fiscal 2006 should be given as the fiscal year focus. Example: 2006. + References No definition available. + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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