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Significant accounting policies - Additional Information (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Significant Accounting Policies [Line Items]
Net cash provided by operating activities	$ 1,658	$ 571
Net cash provided by investing activities	1,445	1,430
Accounting Standards Update 2016-15 [Member]
Significant Accounting Policies [Line Items]
Net cash provided by operating activities		640
Net cash provided by investing activities		$ 640
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

Significant Accounting Policies [Line Items]

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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.

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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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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