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Performance Share Unit, Deferred Stock Unit, and Historically Granted Restricted Stock Activity (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual tax benefit realized for the tax deductions from the shares vested		$ 7
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Actual tax benefit realized for the tax deductions from the shares vested	$ 1

X

- Definition

Disclosure of the aggregate tax benefit realized from stock awards that vested.

+ References

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- Definition

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.

+ References

No definition available.

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