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Significant accounting policies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	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

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No definition available.

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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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