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Benefit Plans (Details) shares in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2017 $ / shares shares	Jun. 30, 2017 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement to be paid in Cash, Liability Award, Grants in period, Weighted Average Grant Date Fair Value | $ / shares	$ 6.33	$ 6.33
Cash-based restricted share unit awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted	5.2
Awards to be settled in cash upon vesting	4.5	4.5
Restricted share awards and share unit awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rate		20.00%
Vesting rate for certain officers and non-employee directors		33.00%

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- Definition

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+ References

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Vesting Rate for Certain Officers and Non-Employee Directors

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Shares to be Settled in Cash Upon Vesting

+ References

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- Definition

Share-based Compensation Arrangement to be paid in Cash, Liability Award, Grants in period, Weighted Average Grant Date Fair Value

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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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- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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