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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2016
Equity [Abstract] |
Change in Accumulated Other Comprehensive Income by Category | The change in accumulated other comprehensive income by category is provided as follows.
| 2016
(in millions) | Opening balance January 1 |  | Net Change |  | Ending balance December 31 |
Net unrealized foreign currency translation gains (losses): |  |  |
Unrealized foreign currency translation gains (losses) on net investments in foreign operations | $ | 1,281 |  | $ | (54 | ) | $ | 1,227 |
(Losses) gains on hedges of net investments in foreign operations | (476 | ) | 4 |  | (472 | )
Income tax recovery | 1 |  | — |  | 1 |
| 806 |  | (50 | ) | 756 |
Available-for-sale investment: (Notes 9, 28 and 30) |  |  |
Realized gain on available-for-sale investment | (2 | ) | 2 |  | — |
Cash flow hedges: (Note 30) |  |  |
Net change in fair value of cash flow hedges | 3 |  | 5 |  | 8 |
Income tax expense | (1 | ) | (2 | ) | (3 | )
| 2 |  | 3 |  | 5 |
Unrealized employee future benefits (losses) gains: (Note 26) |  |  |
Unamortized net actuarial (losses) gains | (20 | ) | 1 |  | (19 | )
Unamortized past service costs | (1 | ) | (2 | ) | (3 | )
Income tax recovery | 6 |  | — |  | 6 |
| (15 | ) | (1 | ) | (16 | )
Accumulated other comprehensive income | $ | 791 |  | $ | (46 | ) | $ | 745 |
| 2015
(in millions) | Opening balance January 1 |  | Net Change |  | Ending balance December 31 |
Net unrealized foreign currency translation gains (losses): |  |  |
Unrealized foreign currency translation gains on net investments in foreign operations | $ | 273 |  | $ | 1,008 |  | $ | 1,281 |
Losses on hedges of net investments in foreign operations | (131 | ) | (345 | ) | (476 | )
Income tax recovery | 2 |  | (1 | ) | 1 |
| 144 |  | 662 |  | 806 |
Available-for-sale investment: (Notes 9, 28 and 30) |  |  |
Unrealized loss on available-for-sale investment | — |  | (2 | ) | (2 | )
Cash flow hedges: (Note 30) |  |  |
Net change in fair value of cash flow hedges | 1 |  | 2 |  | 3 |
Income tax expense | — |  | (1 | ) | (1 | )
| 1 |  | 1 |  | 2 |
Unrealized employee future benefits (losses) gains: (Note 26) |  |  |
Unamortized net actuarial losses | (20 | ) | — |  | (20 | )
Unamortized past service costs | (2 | ) | 1 |  | (1 | )
Income tax recovery | 6 |  | — |  | 6 |
| (16 | ) | 1 |  | (15 | )
Accumulated other comprehensive income | $ | 129 |  | $ | 662 |  | $ | 791 |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=66004124&loc=SL7669686-108580 + Details
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