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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Basic earnings per share – continuing operations: |  |  |  |
Income from continuing operations attributable to common shareholders | $ 513 | $ 470 | $ 1,007 | $ 1,110
Participating securities dividends | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders | $ 513 | $ 470 | $ 1,007 | $ 1,110
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) | $ 1.57 | $ 1.44 | $ 3.09 | $ 3.41
Diluted earnings per share – continuing operations: |  |  |  |
Income from continuing operations attributable to common shareholders | $ 513 | $ 470 | $ 1,007 | $ 1,110
Participating securities dividends | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders | 513 | 470 | 1,007 | 1,110
Income impact of assumed conversions | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders and assumed conversions | $ 513 | $ 470 | $ 1,007 | $ 1,110
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) | 1,000,000 | 2,000,000 | 1,000,000 | 3,000,000
Adjusted weighted average shares - diluted (in shares) | 327,000,000 | 328,000,000 | 327,000,000 | 329,000,000
Diluted earnings per share - continuing operations (in dollars per share) | $ 1.57 | $ 1.43 | $ 3.08 | $ 3.38
Stock option awards |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Stock-based compensation awards excluded from the computation of diluted earnings per share (in shares) | 3,817,072 | 1,365,671 | 6,042,695 | 1,373,736

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