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Significant accounting policies - Additional Information (Detail) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Significant Accounting Policies [Line Items] |  |
Net cash provided by operating activities | $ 2,079 | $ 1,366
Net cash provided by investing activities | 1,792 | 1,534
Accounting Standards Update 2016-15 [Member] |  |
Significant Accounting Policies [Line Items] |  |
Net cash provided by operating activities |  | (962)
Net cash provided by investing activities |  | $ 962
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 Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 + Details
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