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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' Equity Note [Abstract] |
Schedule of Dividends Paid and Payable | The following table provides information about our per share dividends:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Per common share cash dividend declared for the period | $ | 1.00 |  |  | $ | 0.80 |  |  | $ | 0.50 |
Per common share cash dividend paid in the period | 0.95 |  |  | 0.725 |  |  | 0.50 |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) | Cumulative revenues, expenses, gains and losses that under GAAP are included within our comprehensive income but excluded from our earnings are reported as “Accumulated other comprehensive loss” within “Stockholders’ Equity” in our consolidated balance sheets. Changes in the components of our “Accumulated other comprehensive loss” not including non-controlling interests are summarized as follows (in millions):
| Net unrealized gains/(losses) on cash flow hedge derivatives |  | Foreign currency translation adjustments |  | Pension and other postretirement liability adjustments |  | Total Accumulated other comprehensive loss
Balance at December 31, 2016 | $ | (1 | ) |  | $ | (288 | ) |  | $ | (372 | ) |  | $ | (661 | )
Other comprehensive gain before reclassifications | 145 |  |  | 55 |  |  | 40 |  |  | 240 |
Gain reclassified from accumulated other comprehensive loss | (171 | ) |  | — |  |  | — |  |  | (171 | )
KML IPO | — |  |  | 44 |  |  | 7 |  |  | 51 |
Net current-period change in accumulated other comprehensive (loss) income | (26 | ) |  | 99 |  |  | 47 |  |  | 120 |
Balance at December 31, 2017 | (27 | ) |  | (189 | ) |  | (325 | ) |  | (541 | )
Other comprehensive gain (loss) before reclassifications | 111 |  |  | (89 | ) |  | (31 | ) |  | (9 | )
Losses reclassified from accumulated other comprehensive loss(a) | 84 |  |  | 223 |  |  | 22 |  |  | 329 |
Impact of adoption of ASU 2018-02 (see below) | (4 | ) |  | (36 | ) |  | (69 | ) |  | (109 | )
Net current-period change in accumulated other comprehensive income (loss) | 191 |  |  | 98 |  |  | (78 | ) |  | 211 |
Balance at December 31, 2018 | 164 |  |  | (91 | ) |  | (403 | ) |  | (330 | )
Other comprehensive (loss) gain before reclassifications | (177 | ) |  | — |  |  | 77 |  |  | (100 | )
Losses reclassified from accumulated other comprehensive loss(a) | 6 |  |  | 91 |  |  | — |  |  | 97 |
Net current-period change in accumulated other comprehensive (loss) income | (171 | ) |  | 91 |  |  | 77 |  |  | (3 | )
Balance at December 31, 2019 | $ | (7 | ) |  | $ | — |  |  | $ | (326 | ) |  | $ | (333 | )
_______
(a) | Amounts for foreign currency translation adjustments and pension and other postretirement liability adjustments reflect the deferred losses recognized in income during the year ended December 31, 2018 related to the TMPL Sale. Amount for foreign currency translation adjustments reflect the deferred losses recognized in income during the year ended December 31, 2019 related to the sale of KML.
Schedule of Noncontrolling Interests | The caption “Noncontrolling interests” in our accompanying consolidated balance sheets consists of interests that we do not own in the following subsidiaries (in millions):
| December 31,
| 2019 |  | 2018
KML(a) | $ | — |  |  | $ | 514 |
Others | 344 |  |  | 339 |
| $ | 344 |  |  | $ | 853 |
_______
(a) | On December 16, 2019, we completed the sale of all the outstanding common equity of KML, including our 70% interest, to Pembina. See Note 3 for more information.

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