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Significant accounting policies - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Accounting Standards Update 2016-08 [Member] | Cash Flows From Operating Activities [Member] |  |
Significant Accounting Policies [Line Items] |  |
Reclassification from operating activities to Investing activities | $ (444) | $ (334)
Accounting Standards Update 2016-08 [Member] | Cash Flows From Investing Activities [Member] |  |
Significant Accounting Policies [Line Items] |  |
Reclassification from operating activities to Investing activities | 444 | $ 334
Accounting Standards Update 2016-01 [Member] | AOCI Attributable to Parent [Member] |  |
Significant Accounting Policies [Line Items] |  |
New accounting principle adoption | (5) |
Accounting Standards Update 2016-01 [Member] | Retained Earnings [Member] |  |
Significant Accounting Policies [Line Items] |  |
New accounting principle adoption | $ 5 |

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- Definition Cumulative Effect Of Adoption Of New Accounting Standards on Cash Flow Activities + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Significant Accounting Policies [Line Items] + References No definition available. + Details
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- Definition Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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