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Supplemental Cash Flow Information | 12 Months Ended
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Dec. 31, 2018
Supplemental Cash Flow Elements |
Supplemental Cash Flow Information | NOTE 9. Supplemental Cash Flow Information
(Millions) |  | 2018 |  | 2017 |  | 2016 |
Cash income tax payments, net of refunds |  | $ | 1,560 |  | $ | 1,604 |  | $ | 1,888 |
Cash interest payments |  |  | 328 |  |  | 214 |  |  | 194 |
Cash interest payments include interest paid on debt and capital lease balances, including net interest payments/receipts related to accreted debt discounts/premiums, payment of debt issue costs, as well as net interest payments/receipts associated with interest rate swap contracts. Cash interest payments exclude the cash paid for early debt extinguishment costs. Additional details are described in Note 12. Individual amounts in the Consolidated Statement of Cash Flows exclude the impacts of acquisitions, divestitures and exchange rate impacts, which are presented separately. Transactions related to investing and financing activities with significant non-cash components are as follows:
| · |  | 3M sold and leased-back, under capital leases, certain recently constructed machinery and equipment in return for municipal securities with certain cities in the United States. In aggregate, the values totaled approximately $13 million in 2018, $13 million in 2017, and $12 million in 2016, as of the transaction date.

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- Definition The entire disclosure for supplemental cash flow activities, including cash, noncash, and part noncash transactions, for the period. Noncash is defined as information about all investing and financing activities of an enterprise during a period that affect recognized assets or liabilities but that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -URI http://asc.fasb.org/topic&trid=2134446 + Details
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