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Income Taxes - Additional information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Taxes [Line Items]
Effective tax rate of income (loss) before income taxes	35.40%	41.00%
Equity in net losses of unconsolidated entities	$ 7	$ 8
Interest expense	95	104
Investment in Refined Coal Facility [Member]
Income Taxes [Line Items]
Equity in net losses of unconsolidated entities	1	1
Income tax benefit, including tax credits, from equity method investment	4	4
Investment in Low-Income Housing Properties [Member]
Income Taxes [Line Items]
Equity in net losses of unconsolidated entities	5	6
Interest expense	1	1
Affordable housing tax credits and other tax benefits amount from equity method investment	7	7
Tax credits from equity method investment	$ 5	$ 4

X

- Definition

Amount of affordable housing tax credits and other tax benefits recognized.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Income Taxes [Line Items]

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