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Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Basic earnings per share – continuing operations: |  |  |  |
Income from continuing operations attributable to common shareholders | $ 278 | $ 379 | $ 547 | $ 678
Participating securities dividends | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders | $ 278 | $ 379 | $ 547 | $ 678
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) | $ 0.86 | $ 1.16 | $ 1.68 | $ 2.08
Diluted earnings per share – continuing operations: |  |  |  |
Income from continuing operations available to common shareholders | $ 278 | $ 379 | $ 547 | $ 678
Income impact of assumed conversions | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders and assumed conversions | $ 278 | $ 379 | $ 547 | $ 678
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) | 3,000,000 | 2,000,000 | 3,000,000 | 3,000,000
Adjusted weighted average shares - diluted (in shares) | 329,000,000 | 328,000,000 | 329,000,000 | 329,000,000
Diluted earnings per share – continuing operations (in dollars per share) | $ 0.85 | $ 1.15 | $ 1.66 | $ 2.06
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) | 42,890 | 1,981,596 | 47,861 | 1,981,596

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