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Revenue from Contracts with Customers - Additional Information (Detail) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Receivables from contracts with customers, included within Receivables | $ 400 |  | $ 434
Deferred revenue, included within Other liabilities | 3,595 |  | 3,402
Revenue recognized | 533 | $ 473 |
Performance obligations | 13,100 |  |
Deferred NonInsurance Warranty Revenue and Other Liabilities [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Deferred revenue, included within Other liabilities | 3,700 |  | $ 3,500
2019 [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Performance obligations | 1,100 |  |
2020 [Member] |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Performance obligations | $ 2,000 |  |

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130531-203044 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130532-203044 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109196051&loc=SL49130549-203045 + Details
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