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Earnings Per Common Share (EPS) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Basic and diluted: |  |  |
Net income |  | $ 1,426 | $ 1,525
Preferred dividends |  | (21) | 0
Net income available to common stockholders - basic |  | 1,405 | 1,525
Net income available to common stockholders - diluted |  | 1,405 | 1,525
Earnings allocated to participating share awards |  | (11) | (11)
Net income attributable to common shareholders |  | $ 1,394 | $ 1,514
Denominator: |  |  |
Basic |  | 961,000,000 | 1,019,000,000
Add: Weighted-average stock options |  | 2,000,000 | 4,000,000
Diluted |  | 963,000,000 | 1,023,000,000
Earnings Per Common Share, Basic (Note 15) [Abstract] |  |  |
Income from continuing operations attributable to common shareholders | [1] | $ 1.45 | $ 1.49
Earnings Per Common Share, Diluted (Note 15) [Abstract] |  |  |
Income from continuing operations attributable to common shareholders | [1] | $ 1.45 | $ 1.48
Earnings Per Common Share (Textuals) [Abstract] |  |  |
Subordinated debentures |  | $ 750 | $ 750
Subordinated debt issuance year |  | 2006 | 2006
Subordinated debt maturity year |  | 2036 | 2036
Stock options [Member] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |
Antidilutive securities excluded from computation of earnings per Share, amount |  | 1,500,000 | 500,000
[1] | Represents net income less ( i ) earnings allocated to participating share awards of $11 million for both the three months ended March 31 , 2016 and 2015 , and (ii) dividends on preferred shares of $ 21 million and nil for the three months ended March 31 , 2016 and 2015 , respectively.

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- Definition Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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