Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Income Tax Contingency [Line Items]
Estimated effective tax rate	26.30%	22.00%
Effective tax rate	21.40%	10.30%
Total favorable discrete items	$ 36
Net favorable tax audit settlements and expirations of statutes of limitations	16	$ 39
Benefit relating to the U.S. domestic production activities deduction	$ 16
Net unfavorable tax charge related to the sale of joint venture		$ 56

Effective Tax Rate Net Tax Benefits

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- Definition

Estimated Annual Effective Tax Rate From Continuing Operations

+ References

No definition available.

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- Definition

Income tax reconciliation, tax settlements and expiration of statute of limitations.

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- Definition

Amount of income tax expense incurred in the period attributable to disposal group held for sale.

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No definition available.

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h)(2))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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