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Goodwill and Acquired Intangibles - Changes in the Carrying Amount of Goodwill by Segment (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | $ 10,807 | $ 10,764
Other | (38) | 43
Goodwill, ending balance | 10,769 | 10,807
Aeronautics |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 171 | 171
Other | 0 | 0
Goodwill, ending balance | 171 | 171
MFC |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 2,265 | 2,260
Other | (3) | 5
Goodwill, ending balance | 2,262 | 2,265
RMS |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 6,784 | 6,748
Other | (33) | 36
Goodwill, ending balance | 6,751 | 6,784
Space |  |
Goodwill [Roll Forward] |  |
Goodwill, beginning balance | 1,587 | 1,585
Other | (2) | 2
Goodwill, ending balance | $ 1,585 | $ 1,587

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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