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Summary of Significant Accounting Policies (Earnings Per Share) (Details) (USD $) In Millions, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Basic earnings per share - continuing operations: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations available to common shareholders |  |  |  |  |  |  |  |  | $ 879 | $ 1,503 | $ 1,041
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 326,000,000 | 326,000,000 | 326,000,000
Basic earnings (loss) per share – continuing operations (in dollars per share) | $ 0.81 | $ 1.42 | $ (0.33) | $ 0.79 | $ 2.42 | $ 1.09 | $ 0.56 | $ 0.54 | $ 2.70 | $ 4.61 | $ 3.20
Diluted earnings per share - continuing operations: |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations available to common shareholders |  |  |  |  |  |  |  |  | 879 | 1,503 | 1,041
Income impact of assumed conversions |  |  |  |  |  |  |  |  | 1 | (1) | (1)
Income from continuing operations available to common shareholders and assumed conversions |  |  |  |  |  |  |  |  | $ 880 | $ 1,502 | $ 1,040
Weighted average common shares outstanding (in shares) |  |  |  |  |  |  |  |  | 326,000,000 | 326,000,000 | 326,000,000
Incremental shares from assumed conversions (in shares) |  |  |  |  |  |  |  |  | 3,000,000 | 4,000,000 | 3,000,000
Adjusted weighted average shares - diluted (in shares) |  |  |  |  |  |  |  |  | 329,000,000 | 330,000,000 | 329,000,000
Diluted earnings (loss) per share – continuing operations (in dollars per share) | $ 0.81 | $ 1.41 | $ (0.33) | $ 0.78 | $ 2.39 | $ 1.09 | $ 0.55 | $ 0.54 | $ 2.67 | $ 4.55 | $ 3.17
Stock-Based Compensation Awards |  |  |  |  |  |  |  |  |  |  |
Diluted earnings per share - continuing operations: |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation awards excluded from the computation of diluted earnings per share (in shares) |  |  |  |  | 7,492,552 |  |  |  | 3,977,894 |  | 5,847,094

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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 -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: 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 4: 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 + Details
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- Definition The amount of net income (loss) from continuing operations per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 7: 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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