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Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Basic earnings per share – continuing operations: |  |  |  |
Income from continuing operations attributable to common shareholders | $ 378 | $ 496 | $ 1,056 | $ 1,046
Participating securities dividends | 0 | 0 | (1) | 0
Income from continuing operations available to common shareholders | $ 378 | $ 496 | $ 1,055 | $ 1,046
Weighted average common shares outstanding (in shares) | 326,000,000 | 326,000,000 | 326,000,000 | 326,000,000
Basic earnings per share – continuing operations (in dollars per share) | $ 1.16 | $ 1.52 | $ 3.24 | $ 3.21
Diluted earnings per share – continuing operations: |  |  |  |
Income from continuing operations available to common shareholders | $ 378 | $ 496 | $ 1,055 | $ 1,046
Income impact of assumed conversions | 0 | 0 | 1 | 1
Income from continuing operations available to common shareholders and assumed conversions | $ 378 | $ 496 | $ 1,056 | $ 1,047
Weighted average common shares outstanding (in shares) | 326,000,000 | 326,000,000 | 326,000,000 | 326,000,000
Incremental shares from assumed conversions (in shares) | 2,000,000 | 3,000,000 | 3,000,000 | 3,000,000
Adjusted weighted average shares - diluted (in shares) | 328,000,000 | 329,000,000 | 329,000,000 | 329,000,000
Diluted earnings per share – continuing operations (in dollars per share) | $ 1.15 | $ 1.51 | $ 3.21 | $ 3.18
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) | 2,054,876 | 38,800 | 2,054,876 | 62,885

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