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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 Thousands, $ in Millions

6 Months Ended

Jun. 30, 2016

USD ($)

$ / shares

shares

Restricted Stock Units (RSUs)

Equity Instruments Other than Options, Number of Shares Roll Forward

Unvested at January 1, 2016 | shares

1,020

Granted | shares

920

Vested (a) | shares

(360)

^[1]

Forfeited | shares

(20)

Unvested at June 30, 2016 | shares

1,560

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

Unvested at January 1, 2016 | $ / shares

$ 46.36

Granted | $ / shares

32.40

Vested (a) | $ / shares

46.79

^[1]

Forfeited | $ / shares

39.70

Unvested at June 30, 2016 | $ / shares

$ 38.16

Fair value of awards vested | $

$ 17

Performance Share Units

Equity Instruments Other than Options, Number of Shares Roll Forward

Unvested at January 1, 2016 | shares

860

^[2]

Granted | shares

640

^[2]

Vested (a) | shares

(30)

^[2],[3]

Forfeited | shares

0

^[2]

Unvested at June 30, 2016 | shares

1,470

^[2]

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

Unvested at January 1, 2016 | $ / shares

$ 44.97

Granted | $ / shares

32.05

Vested (a) | $ / shares

46.45

^[3]

Forfeited | $ / shares

0.00

Unvested at June 30, 2016 | $ / shares

$ 39.33

Fair value of awards vested | $

$ 1

[1]	The total fair value of RSUs which vested during the six months ended June 30, 2016 was $17 million.
[2]	The PSU amounts in the table are shown at the target amount of the award.
[3]	The total fair value of PSUs which vested during the six months ended June 30, 2016 was $1 million.

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=6415400&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=6415400&loc=d3e5070-113901

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- Definition

The number of grants made 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=6415400&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=6415400&loc=d3e5070-113901

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ 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=6415400&loc=d3e5070-113901

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- Definition

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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=6415400&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)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&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=6415400&loc=d3e5070-113901

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