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Consolidated Statements of Changes in Equity (USD $) In Millions, except Share data | Total | Release of restricted stock units [Member] | Common Shares [Member] | Common Shares [Member] Release of restricted stock units [Member] | Contributed Surplus [Member] | Contributed Surplus [Member] Release of restricted stock units [Member] | Retained Earnings [Member] | AOCI [Member] | Non-controlling Interest [Member]
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2009 | $ 7,299 |  | $ 3,779 |  | $ 32 |  | $ 2,803 | $ 685 |
Beginning Balance, shares at Dec. 31, 2009 |  |  | 223,900,000 |  |  |  |  |  |
Net income | 1,003 |  |  |  |  |  | 1,003 |  |
Other comprehensive income (loss) | 70 |  |  |  |  |  |  | 70 |
Contribution to subsidiaries by non-controlling interests | 3 |  |  |  |  |  |  |  | 3
Shares issued on exercise of stock options | 48 |  | 58 |  | (10) |  |  |  |
Shares issued on exercise of stock options, shares |  |  | 1,500,000 |  |  |  |  |  |
Release of restricted stock | 0 |  | 6 |  | (6) |  |  |  |
Repurchase and cancellation under normal course issuer bid [note 18] | (27) |  | (11) |  |  |  | (13) | (3) |
Repurchase and cancellation under normal course issuer bid, shares [note 18] |  |  | (800,000) |  |  |  |  |  |
Shares issued under the Arrangement [note 18] | 666 |  | 666 |  |  |  |  |  |
Shares issued under the Arrangement, shares [note 18] |  |  | 18,000,000 |  |  |  |  |  |
Repurchase of Class B Shares [note 18] | (976) |  |  |  |  |  | (976) |  |
Stock-based compensation expense [note 17] | 52 |  |  |  | 52 |  |  |  |
Settlement of stock options | (12) |  |  |  | (12) |  |  |  |
Dividends paid | (100) |  | 2 |  |  |  | (102) |  |
Ending Balance at Dec. 31, 2010 | 8,026 |  | 4,500 |  | 56 |  | 2,715 | 752 | 3
Ending Balance, shares at Dec. 31, 2010 |  |  | 242,600,000 |  |  |  |  |  |
Net income | 1,015 |  |  |  |  |  | 1,018 |  | (3)
Other comprehensive income (loss) | (289) |  |  |  |  |  |  | (289) |
Contribution to subsidiaries by non-controlling interests | 20 |  |  |  |  |  |  |  | 20
Acquisition of subsidiaries | 7 |  |  |  |  |  |  |  | 7
Shares issued on exercise of stock options | 59 |  | 69 |  | (10) |  |  |  |
Shares issued on exercise of stock options, shares |  |  | 1,400,000 |  |  |  |  |  |
Release of restricted stock | 0 |  | 6 |  | (6) |  |  |  |
Repurchase and cancellation under normal course issuer bid [note 18] | (407) |  | (204) |  |  |  | (162) | (41) |
Repurchase and cancellation under normal course issuer bid, shares [note 18] |  |  | (10,700,000) |  |  |  |  |  |
Stock-based compensation expense [note 17] | 31 |  |  |  | 31 |  |  |  |
Settlement of stock options | (24) |  |  |  | (8) |  | (16) |  |
Dividends paid | (236) |  | 2 |  |  |  | (238) |  |
Ending Balance at Dec. 31, 2011 | 8,202 |  | 4,373 |  | 63 |  | 3,317 | 422 | 27
Ending Balance, shares at Dec. 31, 2011 |  |  | 233,300,000 |  |  |  |  |  |
Net income | 1,426 |  |  |  |  |  | 1,433 |  | (7)
Other comprehensive income (loss) | 80 |  |  |  |  |  |  | 78 | 2
Acquisition of subsidiaries | 7 |  |  |  |  |  |  |  | 7
Shares issued on exercise of stock options | 14 |  | 19 |  | (5) |  |  |  |
Shares issued on exercise of stock options, shares |  |  | 400,000 |  |  |  |  |  |
Release of restricted stock | 0 | 0 | 5 | 5 | (5) | (5) |  |  |
Repurchase and cancellation under normal course issuer bid [note 18] | (42) |  | (18) |  |  |  | (20) | (4) |
Repurchase and cancellation under normal course issuer bid, shares [note 18] |  |  | (800,000) |  |  |  |  |  |
Stock-based compensation expense [note 17] | 39 |  |  |  | 39 |  |  |  |
Settlement of stock options | (16) |  |  |  | (7) |  | (9) |  |
Dividends paid | (252) |  | 7 |  |  |  | (259) |  |
Dividends paid, shares |  |  | 200,000 |  |  |  |  |  |
Ending Balance at Dec. 31, 2012 | $ 9,458 |  | $ 4,391 |  | $ 80 |  | $ 4,462 | $ 496 | $ 29
Ending Balance, shares at Dec. 31, 2012 |  |  | 233,100,000 |  |  |  |  |  |

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section B -Paragraph 11A -Chapter 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30, 31 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration