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Summary of Significant Accounting Policies (Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Basic earnings per share – continuing operations: |  |
Income from continuing operations attributable to common shareholders | $ 218 | $ 362
Participating securities dividends | 0 | 0
Income from continuing operations available to common shareholders | $ 218 | $ 362
Weighted average common shares outstanding (in shares) | 326,000,000 | 326,000,000
Basic earnings per share - continuing operations (in dollars per share) | $ 0.67 | $ 1.11
Diluted earnings per share – continuing operations: |  |
Income from continuing operations attributable to common shareholders | $ 218 | $ 362
Participating securities dividends | 0 | 0
Income from continuing operations available to common shareholders | 218 | 362
Income impact of assumed conversions | 0 | 0
Income from continuing operations available to common shareholders and assumed conversions | $ 218 | $ 362
Weighted average common shares outstanding (in shares) | 326,000,000 | 326,000,000
Incremental shares from assumed conversions (in shares) | 1,000,000 | 3,000,000
Adjusted weighted average shares - diluted (in shares) | 327,000,000 | 329,000,000
Diluted earnings per share - continuing operations (in dollars per share) | $ 0.67 | $ 1.10
Stock option awards |  |
Diluted earnings per share – continuing operations: |  |
Stock-based compensation awards excluded from the computation of diluted earnings per share (in shares) | 6,222,294 | 1,355,930

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