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Note 12. Stock-Based Compensation Incentive Equity Awards Activity - Summary of Option Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Options, Weighted Average Exercise Price Roll Forward |  |  |  |  |
Intrinsic value of options exercised |  | $ 5 |  |  |
Proceeds from exercise of stock options |  | 5 |  | $ 6 | $ 5
Intrinsic value of outstanding options |  | $ 31 |  |  |
Weighted average remaining contractual life of outstanding options |  | 6 years 7 months |  |  |
Options |  |  |  |  |
Options, Number of Shares Roll Forward |  |  |  |  |
Outstanding at January 1, 2015 |  | 3,220,000.00 |  |  |
Granted |  | 180,000.00 |  |  |
Exercised (a) (b) | [1],[2] | (210,000.00) |  |  |
Forfeited/Expired |  | (40,000.00) |  |  |
Outstanding at December 31, 2015 (c) |  | 3,150,000.00 | [3] | 3,220,000.00 |
Options, Weighted Average Exercise Price Roll Forward |  |  |  |  |
Outstanding at January 1, 2015 |  | $ 30.02 |  |  |
Granted |  | 46.45 |  |  |
Exercised (a) (b) | [1],[2] | 22.09 |  |  |
Forfeited/Expired |  | 32.48 |  |  |
Outstanding at December 31, 2015 (c) |  | $ 31.42 | [3] | $ 30.02 |
[1] | (a)The intrinsic value of options exercised during the year ended December 31, 2015 was $5 million.
[2] | (b)Cash received from options exercised during the year ended December 31, 2015 was $5 million.
[3] | (c)Options outstanding at December 31, 2015 had an intrinsic value of $31 million and have a weighted average remaining contractual life of 6.6 years.

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- Definition For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price of options that were either forfeited or expired. + 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)-(4) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + 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=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option 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)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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