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Receivables, net, Contract Assets and Contract Liabilities - Narrative (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
U.S. government receivables | $ 1,900 |  |
Receivables from other governments and commercial customers | 2,444 | $ 2,265 |
Contract assets, progress payments | 30,200 | 19,900 |
Increase in contract assets | 1,480 | (390) | $ 1,246
Impairment loss | 0 | 0 |
Increase (decrease) in contract liability | (537) | 353 | (163)
Liability, revenue recognized | 3,900 | $ 3,300 | $ 3,700
Other Governments and Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Receivables from other governments and commercial customers | $ 578 |  |

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- Definition Amount of impairment loss for asset recognized from cost incurred to obtain or fulfill contract with customer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054 + Details
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