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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Basic earnings per share – continuing operations: |  |  |  |
Income from continuing operations attributable to common shareholders | $ 278 | $ 282 | $ 640 | $ 562
Participating securities dividends | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders | $ 278 | $ 282 | $ 640 | $ 562
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) | $ 0.85 | $ 0.87 | $ 1.96 | $ 1.72
Diluted earnings per share – continuing operations: |  |  |  |
Income from continuing operations attributable to common shareholders | $ 278 | $ 282 | $ 640 | $ 562
Participating securities dividends | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders | 278 | 282 | 640 | 562
Income impact of assumed conversions | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders and assumed conversions | $ 278 | $ 282 | $ 640 | $ 562
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 | 4,000,000 | 3,000,000 | 4,000,000
Adjusted weighted average shares - diluted (in shares) | 329,000,000 | 330,000,000 | 329,000,000 | 330,000,000
Diluted earnings per share - continuing operations (in dollars per share) | $ 0.85 | $ 0.86 | $ 1.95 | $ 1.70
Stock option awards |  |  |  |
Diluted earnings per share – continuing operations: |  |  |  |
Stock-based compensation awards excluded from the computation of diluted earnings per share (in shares) | 1,327,310 | 42,890 | 1,370,200 | 47,861

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