| Accumulated Other Comprehensive Income
The following tables summarize the changes in AOCI for the three and nine months ended September 30, 2018 and 2017 (in millions):
| | | | | | | | | | | | | | | | | | | | | | Unrealized Gains (Losses) on Derivative Instruments | | Unrealized Gains (Losses) on Investments | | Foreign Currency Translation | | Estimated Tax (Expense) Benefit | | Total | Balance as of June 30, 2018 | $ | 51 |
| | $ | (53 | ) | | $ | 555 |
| | $ | 28 |
| | $ | 581 |
| Other comprehensive income (loss) before reclassifications | (4 | ) | | 8 |
| | (25 | ) | | (1 | ) | | (22 | ) | Less: Amount of gain (loss) reclassified from AOCI | 12 |
| | — |
| | — |
| | (3 | ) | | 9 |
| Net current period other comprehensive income (loss) | (16 | ) | | 8 |
| | (25 | ) | | 2 |
| | (31 | ) | Balance as of September 30, 2018 | $ | 35 |
| | $ | (45 | ) | | $ | 530 |
| | $ | 30 |
| | $ | 550 |
|
| | | | | | | | | | | | | | | | | | | | | | Unrealized Gains (Losses) on Derivative Instruments | | Unrealized
Gains (Losses) on
Investments | | Foreign Currency Translation | | Estimated Tax (Expense) Benefit | | Total | Balance as of December 31, 2017 | $ | (57 | ) | | $ | (15 | ) | | $ | 748 |
| | $ | 41 |
| | $ | 717 |
| Other comprehensive income (loss) before reclassifications | 55 |
| | (31 | ) | | (218 | ) | | (3 | ) | | (197 | ) | Less: Amount of gain (loss) reclassified from AOCI | (37 | ) | | (1 | ) | | — |
| | 8 |
| | (30 | ) | Net current period other comprehensive income (loss) | 92 |
| | (30 | ) | | (218 | ) | | (11 | ) | | (167 | ) | Balance at September 30, 2018 | $ | 35 |
| | $ | (45 | ) | | $ | 530 |
| | $ | 30 |
| | $ | 550 |
|
| | | | | | | | | | | | | | | | | | | | | | Unrealized Gains (Losses) on Derivative Instruments | | Unrealized
Gains (Losses) on
Investments | | Foreign
Currency
Translation | | Estimated Tax (Expense) Benefit | | Total | Balance as of June 30, 2017 | $ | (44 | ) | | $ | 2 |
| | $ | 446 |
| | $ | 33 |
| | $ | 437 |
| Other comprehensive income (loss) before reclassifications | (31 | ) | | 3 |
| | 115 |
| | 3 |
| | 90 |
| Less: Amount of gain (loss) reclassified from AOCI | (7 | ) | | (4 | ) | | — |
| | — |
| | (11 | ) | Net current period other comprehensive income (loss) | (24 | ) | | 7 |
| | 115 |
| | 3 |
| | 101 |
| Balance as of September 30, 2017 | $ | (68 | ) | | $ | 9 |
| | $ | 561 |
| | $ | 36 |
| | $ | 538 |
|
| | | | | | | | | | | | | | | | | | | | | | Unrealized Gains (Losses) on Derivative Instruments | | Unrealized
Gains (Losses) on
Investments | | Foreign
Currency
Translation | | Estimated Tax (Expense) Benefit | | Total | Balance as of December 31, 2016 | $ | 54 |
| | $ | 51 |
| | $ | (230 | ) | | $ | 1 |
| | $ | (124 | ) | Other comprehensive income (loss) before reclassifications | (94 | ) | | (29 | ) | | 791 |
| | 35 |
| | 703 |
| Less: Amount of gain (loss) reclassified from AOCI | 28 |
| | 13 |
| | — |
| | — |
| | 41 |
| Net current period other comprehensive income (loss) | (122 | ) | | (42 | ) | | 791 |
| | 35 |
| | 662 |
| Balance as of September 30, 2017 | $ | (68 | ) | | $ | 9 |
| | $ | 561 |
| | $ | 36 |
| | $ | 538 |
|
The following table provides details about reclassifications out of AOCI for the three and nine months ended September 30, 2018 and 2017 (in millions):
| | | | | | | | | | | | | | | | | | | | Details about AOCI Components | | Affected Line Item in the Statement of Income | | Amount of Gain (Loss) Reclassified From AOCI | | | | | Three Months Ended
September 30, | | Nine Months Ended
September 30, | | | | | 2018 | | 2017 | | 2018 | | 2017 | Gains (losses) on cash flow hedges - foreign exchange contracts | | Net Revenues | | $ | 12 |
| | $ | (7 | ) | | $ | (37 | ) | | $ | (7 | ) | | | Cost of net revenues | | — |
| | — |
| | — |
| | 3 |
| | | Sales and marketing | | — |
| | — |
| | — |
| | 1 |
| | | Product development | | — |
| | — |
| | — |
| | 5 |
| | | General and administrative | | — |
| | — |
| | — |
| | 2 |
| | | Interest and other, net | | — |
| | — |
| | — |
| | 24 |
| | | Total, from continuing operations before income taxes | | 12 |
| | (7 | ) | | (37 | ) | | 28 |
| | | Provision for income taxes | | (3 | ) | | — |
| | 8 |
| | — |
| | | Total, net of income taxes | | 9 |
| | (7 | ) | | (29 | ) | | 28 |
| | | | | | | | | | | | Unrealized gains (losses) on investments | | Interest and other, net | | — |
| | (4 | ) | | (1 | ) | | 13 |
| | | Total, before income taxes | | — |
| | (4 | ) | | (1 | ) | | 13 |
| | | Provision for income taxes | | — |
| | — |
| | — |
| | — |
| | | Total, net of income taxes | | — |
| | (4 | ) | | (1 | ) | | 13 |
| | | | | | | | | | | | Total reclassifications for the period | | Total, net of income taxes | | $ | 9 |
| | $ | (11 | ) | | $ | (30 | ) | | $ | 41 |
|
|