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Note 2. Summary of Significant Accounting Policies Supplemental Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Capital Lease Obligations Incurred	$ 17	$ 8	$ 14
Noncash tenant improvements			6
2012 Bonus Plan [Member]
Stock Issued			$ 22

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- Definition

Noncash additions of tenant improvements during the period.

+ References

No definition available.

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- Definition

The increase during the period in capital lease obligations due to entering into new capital leases.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

The fair value of stock issued in noncash financing activities.

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-SubTopic 10
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