The following table provides the components of accumulated other comprehensive income for the three months ended June 30, 2013:
| | | | | | | | | | | | | | | | | (in millions) | Foreign Currency Translation | | Postretirement Benefit Plans | | Derivative Instruments | | Total | Balance at April 1, 2013 | $ | 293 |
| | $ | (219 | ) | | $ | (2 | ) | | $ | 72 |
| Foreign currency translation adjustment | (21 | ) | | — |
| | — |
| | (21 | ) | Amortization of net actuarial loss on postretirement benefit plans into: | | | | | | | | Cost of revenue | — |
| | 1 |
| | — |
| | 1 |
| Selling, general and administrative expenses | — |
| | 3 |
| | — |
| | 3 |
| Other non-operating expense, net | — |
| | 1 |
| | — |
| | 1 |
| Income tax expense on amortization of postretirement benefit plan items | — |
| | (1 | ) | | — |
| | (1 | ) | Balance at June 30, 2013 | $ | 272 |
| | $ | (215 | ) | | $ | (2 | ) | | $ | 55 |
|
The following table provides the components of accumulated other comprehensive income for the six months ended June 30, 2013:
| | | | | | | | | | | | | | | | | (in millions) | Foreign Currency Translation | | Postretirement Benefit Plans | | Derivative Instruments | | Total | Balance at January 1, 2013 | $ | 336 |
| | $ | (222 | ) | | $ | 1 |
| | $ | 115 |
| Foreign currency translation adjustment | (64 | ) | | — |
| | — |
| | (64 | ) | Amortization of net actuarial loss on postretirement benefit plans into: | | | | | | | | Cost of revenue | — |
| | 2 |
| | — |
| | 2 |
| Selling, general and administrative expenses | — |
| | 5 |
| | — |
| | 5 |
| Other non-operating expense, net | — |
| | 2 |
| | — |
| | 2 |
| Income tax expense on amortization of postretirement benefit plan items | — |
| | (2 | ) | | — |
| | (2 | ) | Unrealized loss on foreign exchange agreements | — |
| | — |
| | (2 | ) | | (2 | ) | Reclassification of unrealized gain on foreign exchange agreements into revenue | — |
| | — |
| | (1 | ) | | (1 | ) | Balance at June 30, 2013 | $ | 272 |
| | $ | (215 | ) | | $ | (2 | ) | | $ | 55 |
|
|