Description of Business and Significant Accounting Policies Redeemable Noncontrolling Interest (Details) (NCR Manaus [Member], USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
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Dec. 31, 2012
|
Dec. 31, 2011
|
|
NCR Manaus [Member]
|
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Redeemable Noncontrolling Interest [Line Items] | ||
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 49.00% | |
Proceeds from sale of noncontrolling interest | $ 43 | |
Redeemable Noncontrolling Interests, Defined Financial Performance Period | 5 years |