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Stock-Based Compensation Incentive Equity Awards Activity - Summary of Restricted Stock Unit and Performance Unit Activity (Details)
$ / shares in Units, shares in Millions, $ in Millions

6 Months Ended

Jun. 30, 2017

USD ($)

$ / shares

shares

Restricted Stock Units (RSUs)

Equity Instruments Other than Options, Number of Shares Roll Forward

Unvested at January 1, 2017 | shares

1.4

Granted | shares

1.1

Vested (a) | shares

(0.6)

^[1]

Forfeited | shares

(0.1)

Unvested at June 30, 2017 | shares

1.8

Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward

Unvested at January 1, 2017 | $ / shares

$ 37.53

Granted | $ / shares

28.19

Vested (a) | $ / shares

39.58

^[1]

Forfeited | $ / shares

31.19

Unvested at June 30, 2017 | $ / shares

$ 31.36

Fair value of awards vested | $

$ 25

Performance Share Units

Equity Instruments Other than Options, Number of Shares Roll Forward

Unvested at January 1, 2017 | shares

1.0

^[2]

Granted | shares

0.7

^[2]

Vested (a) | shares

0.0

^[2]

Forfeited | shares

0.0

^[2]

Unvested at June 30, 2017 | shares

1.7

^[2]

Equity Instruments Other than Options, Weighted Average Grant Date Fair Value Roll Forward

Unvested at January 1, 2017 | $ / shares

$ 36.66

Granted | $ / shares

27.70

Vested (a) | $ / shares

0.00

Forfeited | $ / shares

0.00

Unvested at June 30, 2017 | $ / shares

$ 32.71

[1]	The total fair value of RSUs which vested during the six months ended June 30, 2017 was $25 million.
[2]	The PSU amounts in the table are shown at the target amount of the award.

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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+ References

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

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target 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
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

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+ References

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

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- Definition

The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

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

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+ References

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

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ References

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

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+ References

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

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