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Note 12. 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

12 Months Ended

Dec. 31, 2016

USD ($)

$ / shares

shares

Restricted Stock Units

Equity Instruments Other than Options, Number of Shares Roll Forward

Unvested at January 1, 2016 | shares

1,000

Granted | shares

1,000

Vested (a) | shares

(500)

^[1]

Forfeited/Expired | shares

(100)

Unvested at December 31, 2016 | shares

1,400

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

Unvested at January 1, 2016 | $ / shares

$ 46.36

Granted | $ / shares

32.29

Vested (a) | $ / shares

45.84

^[1]

Forfeited/Expired | $ / shares

37.61

Unvested at December 31, 2016 | $ / shares

$ 37.53

Fair Value of Shares Vested in Period | $

$ 23

Performance Share Units

Equity Instruments Other than Options, Number of Shares Roll Forward

Unvested at January 1, 2016 | shares

900

Granted | shares

600

^[2]

Vested (a) | shares

(400)

^[3]

Forfeited/Expired | shares

(100)

^[4]

Unvested at December 31, 2016 | shares

1,000

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

Unvested at January 1, 2016 | $ / shares

$ 44.97

Granted | $ / shares

31.89

^[2]

Vested (a) | $ / shares

44.27

^[3]

Forfeited/Expired | $ / shares

46.69

^[4]

Unvested at December 31, 2016 | $ / shares

$ 36.71

Fair Value of Shares Vested in Period | $

$ 15

[1]	(a)The total fair value of RSUs which vested during the year ended December 31, 2016 was $23 million.
[2]	(a)The PSU amounts granted in the table are shown at the target amount of the award.
[3]	(b)The total fair value of PSUs which vested during the year ended December 31, 2016 was $15 million.
[4]	(c)Includes the difference between PSU's granted at target and amounts earned.

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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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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+ 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

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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=6415400&loc=d3e5070-113901

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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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+ References

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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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+ 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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