| In millions, except per share items | Dec-31-21 | Dec-31-20 | Dec-31-19 |
| | S-1/A | S-1/A | S-1/A |
| Cash flows from operating activities | | | |
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| Adjustments to reconcile net income to net cash from operating activities | | | |
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| Changes in operating assets and liabilities: | | | |
| Current portion of deferred revenue | | | |
| Net investments in sales-type leases | | | |
| Operating lease assets and liabilities | | | |
| |
| Cash flows from investing activities | | | |
| |
| Cash flows from financing activities | | | |
| |
| Contributions | | | |
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| Cash, cash equivalents and restricted cash | | | |