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Earnings Per Common Share (EPS) (Details) (USD $) In Millions, except Per Share data | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Basic and diluted: |  |  |  |  |  |  |  |
Income from continuing operations | $ 1,295 |  | $ 1,017 |  | $ 2,472 |  | $ 1,902 |
Earnings allocated to participating share awards and other items | (15) |  | (13) |  | (30) |  | (25) |
Income from discontinued operations, net of tax | 36 |  | 0 |  | 36 |  | 0 |
Net income attributable to common shareholders | 1,316 |  | 1,004 |  | 2,478 |  | 1,877 |
Average common shares outstanding for earnings per common share: |  |  |  |  |  |  |  |
Basic: Weighted-average common stock | 1,190 |  | 1,190 |  | 1,190 |  | 1,188 |
Add: weighted-average stock options and warrants | 7 |  | 7 |  | 7 |  | 6 |
Diluted | 1,197 |  | 1,197 |  | 1,197 |  | 1,194 |
Basic EPS: |  |  |  |  |  |  |  |
Income from continuing operations attributable to common shareholders | $ 1.08 | [1] | $ 0.84 | [1] | $ 2.05 | [2] | $ 1.58 | [2]
Income from discontinued operations, net of tax | $ 0.03 | [1] | $ 0 | [1] | $ 0.03 | [2] | $ 0 | [2]
Net income attributable to common shareholders | $ 1.11 | [1] | $ 0.84 | [1] | $ 2.08 | [2] | $ 1.58 | [2]
Diluted EPS: |  |  |  |  |  |  |  |
Income from continuing operations attributable to common shareholders | $ 1.07 | [1] | $ 0.84 | [1] | $ 2.04 | [2] | $ 1.57 | [2]
Income from discontinued operations, net of tax | $ 0.03 | [1] | $ 0 | [1] | $ 0.03 | [2] | $ 0 | [2]
Net income attributable to common shareholders | $ 1.10 | [1] | $ 0.84 | [1] | $ 2.07 | [2] | $ 1.57 | [2]
Earnings Per Common Share (Textuals) [Abstract] |  |  |  |  |  |  |  |
Subordinated debentures | $ 750 |  | $ 750 |  | $ 750 |  | $ 750 |
Stock Options [Member] |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |
Antidilutive securities excluded from computation of earnings per Share, amount | 19 |  | 35 |  | 20 |  | 38 |
[1] | Represents income from continuing operations or net income, as applicable, less earnings allocated to participating share awards and other items of $15 million and $13 million for the three months ended June 30, 2011 and 2010, respectively.
[2] | Represents income from continuing operations or net income, as applicable, less earnings allocated to participating share awards and other items of $30 million and $25 million for the six months ended June 30, 2011 and 2010, respectively.

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 13, 14 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 171 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c + Details
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- Definition Including the current and noncurrent portions, the carrying value of convertible subordinated debt, as of the balance sheet date, initially scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Article 5 -Subsection 20, 22 + Details
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- Definition The amount of net income or loss for the period per each share of common stock and dilutive common stock equivalents outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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- Definition This element represents the income or loss from continuing operations attributable to the reporting entity which may also be defined as revenue less expenses and taxes from ongoing operations before extraordinary items and cumulative effects of changes in accounting principles, but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 28 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 38 -Subparagraph b(1) + Details
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- Definition The amount of income (loss) from continuing operations per each share of common stock outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 + Details
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- Definition The amount of income (loss) from continuing operations available to each share of common stock outstanding during the reporting period and each share that would have been outstanding assuming the issuance of common shares for all dilutive potential common shares outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 11, 12, 36, 37, 38 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 + Details
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- Definition This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items and the cumulative effect of accounting changes before deduction or consideration of the amount which may be allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 13 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 29 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 43 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 47 -Subparagraph c + Details
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- Definition Contracts and securities that allow the holder to buy common stock from the entity. A call option that gives the holder the right, but not the obligation, to purchase shares of common stock from the entity in accordance with an agreement upon payment of a specified amount. A warrant is a security that gives the holder the right to purchase common stock in accordance with the terms of the instrument, usually upon payment of a specified amount. The dilutive effect of which is reflected in diluted EPS by application of the treasury stock method unless another method is required to be applied. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph a Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 17, 18, 19, 171 + Details
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