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Commitments and Contingencies Warranty Reserve (Tables) | 12 Months Ended
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Dec. 31, 2019
Product Warranty Liability [Line Items] |
Schedule of Product Warranty Liability [Table Text Block] | The Company recorded the activity related to the warranty reserve for the years ended December 31 as follows:
In millions | 2019 |  | 2018 |  | 2017
Warranty reserve liability |  |  |  |  |
Beginning balance as of January 1 | $ | 26 |  |  | $ | 26 |  |  | $ | 27 |
Accruals for warranties issued | 37 |  |  | 42 |  |  | 43 |
Settlements (in cash or in kind) | (42) |  |  | (42) |  |  | (44) |
Ending balance as of December 31 | $ | 21 |  |  | $ | 26 |  |  | $ | 26 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249 + Details
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