XML 124 R54.htm IDEA: XBRL DOCUMENT
v3.20.1

Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2019
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Loss | The following is a continuity schedule of accumulated other comprehensive loss:
|  | 2019 |  |  | 2018 |
Accumulated net unrealized loss on translation of net investment in foreign operations |  |  |  |  |  |  |  |
Balance, beginning of year |  | $ | (917 | ) |  | $ | (456 | )
Net unrealized loss |  |  | (18 | ) |  |  | (490 | )
Repurchase of shares under normal course issuer bids [note 21] |  |  | 28 |  |  |  | 29 |
Balance, end of year |  |  | (907 | ) |  |  | (917 | )
Accumulated net unrealized gain (loss) on cash flow hedges [b] |  |  |  |  |  |  |  |
Balance, beginning of year |  |  | (68 | ) |  |  | 39 |
Net unrealized gain (loss) |  |  | 102 |  |  |  | (106 | )
Reclassification of net loss (gain) to net income [a] |  |  | 4 |  |  |  | (1 | )
Balance, end of year |  |  | 38 |  |  |  | (68 | )
Accumulated net unrealized loss on other long-term liabilities [b] |  |  |  |  |  |  |  |
Balance, beginning of year |  |  | (190 | ) |  |  | (183 | )
Net unrealized loss |  |  | (47 | ) |  |  | (13 | )
Reclassification of net loss to net income [a] |  |  | 8 |  |  |  | 6 |
Sale of business |  |  | 8 |  |  |  | — |
Balance, end of year |  |  | (221 | ) |  |  | (190 | )
Total accumulated other comprehensive loss [ c ] |  | $ | (1,090 | ) |  | $ | (1,175 | )
Schedule of Net Income Amounts Reclassified from AOCL |
[a] | The effects on net income of amounts reclassified from AOCL, with presentation location, were as follows:
|  | 2019 |  |  | 2018 |
Cash flow hedges |  |  |  |  |  |  |  |
Sales |  | $ | (38 | ) |  | $ | (6 | )
Cost of sales |  |  | 33 |  |  |  | 7 |
Income tax |  |  | 1 |  |  |  | — |
Net of tax |  |  | (4 | ) |  |  | 1 |
Other long-term liabilities |  |  |  |  |  |  |  |
Cost of sales |  |  | (9 | ) |  |  | (7 | )
Income tax |  |  | 1 |  |  |  | 1 |
Net of tax |  |  | (8 | ) |  |  | (6 | )
Total loss reclassified to net income |  | $ | (12 | ) |  | $ | (5 | )
Summary of Income Tax Benefit (Expense) to Component of Other Comprehensive Loss |
[b] | The amount of income tax benefit that has been allocated to each component of other comprehensive loss is as follows:
|  | 2019 |  |  | 2018 |
Accumulated net unrealized loss on translation of net investment in foreign operations |  |  |  |  |  |  |  |
Balance, end of year |  | $ | 7 |  |  | $ | 7 |
Accumulated net unrealized (gain) loss on cash flow hedges |  |  |  |  |  |  |  |
Balance, beginning of year |  |  | 23 |  |  |  | (12 | )
Net unrealized (gain) loss |  |  | (36 | ) |  |  | 35 |
Reclassification of net loss to net income |  |  | (1 | ) |  |  | — |
Balance, end of year |  |  | (14 | ) |  |  | 23 |
Accumulated net unrealized loss on other long-term liabilities |  |  |  |  |  |  |  |
Balance, beginning of year |  |  | 21 |  |  |  | 17 |
Net unrealized loss |  |  | 15 |  |  |  | 5 |
Reclassification of net loss to net income |  |  | (1 | ) |  |  | (1 | )
Balance, end of year |  |  | 35 |  |  |  | 21 |
Total income tax benefit |  | $ | 28 |  |  | $ | 51 |

X
- Definition Schedule Of Income Tax Expense Benefit Relating To Accumulated Other Comprehensive Income Table [Text Block] + References No definition available. + Details
Name: | mga_ScheduleOfIncomeTaxExpenseBenefitRelatingToAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | mga_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_EquityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of information about items reclassified out of accumulated other comprehensive income (loss). + References No definition available. + Details
Name: | us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=118930883&loc=SL7669686-108580 + Details
Name: | us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration