| In millions, except per share items | Sep-30-15 | Jun-30-15 | Mar-31-15 | Dec-31-14 | Sep-30-14 | Jun-30-14 | Mar-31-14 | Dec-31-13 |
| | 10-Q | 10-Q | 10-Q | 8-K | 10-Q | 10-Q | 10-Q | 10-K |
| Cash flows from operating activities: | | | | | | | | |
| Adjustments to reconcile net income to net cash from operating activities: | | | | | | | | |
| Provision for asset impairment | | | | | | | | |
| Impairment of investment securities | | | | | | | | |
| Gain from settlement of receivables | | | | | | | | |
| Changes in assets and liabilities: | | | | | | | | |
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| Cash flows from investing activities: | | | | | | | | |
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| Cash flows from financing activities: | | | | | | | | |
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| Supplemental disclosure of cash flow information | | | | | | | | |