Changes in accumulated other comprehensive loss, net of tax, for the three and six months ended June 30, 2019 and 2018: | | | | | | | | | | | | | | | | | | | | | | | | | | | | Three Months Ended June 30, 2019 | | Three Months Ended June 30, 2018 | (Millions of Dollars) | | Gains and Losses on Cash Flow Hedges | | Defined Benefit Pension and Postretirement Items | | Total | | Gains and Losses on Cash Flow Hedges | | Defined Benefit Pension and Postretirement Items | | Total | Accumulated other comprehensive loss at April 1 | | $ | (66 | ) | | $ | (61 | ) | | $ | (127 | ) | | $ | (58 | ) | | $ | (66 | ) | | $ | (124 | ) | Other comprehensive (loss) gain before reclassifications (net of taxes of $(3), $0, $0 and $0, respectively) | | (10 | ) | | 1 |
| | (9 | ) | | — |
| | — |
| | — |
| Losses reclassified from net accumulated other comprehensive loss: | | | | | | | | | | | |
|
| Interest rate derivatives (net of taxes of $0) (a) | | 1 |
| | — |
| | 1 |
| | 1 |
| | — |
| | 1 |
| Amortization of net actuarial loss (net of taxes of $0, $0, $0 and $1, respectively) (b) | | — |
| | — |
| | — |
| | — |
| | 1 |
| | 1 |
| Net current period other comprehensive income | | (9 | ) | | 1 |
| | (8 | ) | | 1 |
| | 1 |
| | 2 |
| Accumulated other comprehensive loss at June 30 | | $ | (75 | ) | | $ | (60 | ) | | $ | (135 | ) | | $ | (57 | ) | | $ | (65 | ) | | $ | (122 | ) |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | Six Months Ended June 30, 2019 | | Six Months Ended June 30, 2018 | (Millions of Dollars) | | Gains and Losses on Cash Flow Hedges | | Defined Benefit Pension and Postretirement Items | | Total | | Gains and Losses on Cash Flow Hedges | | Defined Benefit Pension and Postretirement Items | | Total | Accumulated other comprehensive loss at Jan. 1 | | $ | (60 | ) | | $ | (64 | ) | | $ | (124 | ) | | $ | (58 | ) | | $ | (67 | ) | | $ | (125 | ) | Other comprehensive (loss) gain before reclassifications (net of taxes of $(5), $1, $0 and $0, respectively) | | (17 | ) | | 3 |
| | (14 | ) | | — |
| | — |
| | — |
| Losses reclassified from net accumulated other comprehensive loss: | | | | | | | | | | | | | Interest rate derivatives (net of taxes of $0) (a) | | 2 |
| | — |
| | 2 |
| | 1 |
| | — |
| | 1 |
| Amortization of net actuarial loss (net of taxes of $0, $0, $0 and $1, respectively) (b) | | — |
| | 1 |
| | 1 |
| | — |
| | 2 |
| | 2 |
| Net current period other comprehensive income | | (15 | ) | | 4 |
| | (11 | ) | | 1 |
| | 2 |
| | 3 |
| Accumulated other comprehensive loss at June 30 | | $ | (75 | ) | | $ | (60 | ) | | $ | (135 | ) | | $ | (57 | ) | | $ | (65 | ) | | $ | (122 | ) |
|