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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Basic earnings per share – continuing operations: |  |  |  |
Income from continuing operations attributable to common shareholders | $ 392 | $ 276 | $ 670 | $ 494
Participating securities dividends | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders | $ 392 | $ 276 | $ 670 | $ 494
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) | $ 1.20 | $ 0.85 | $ 2.05 | $ 1.52
Diluted earnings per share – continuing operations: |  |  |  |
Income from continuing operations attributable to common shareholders | $ 392 | $ 276 | $ 670 | $ 494
Participating securities dividends | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders | 392 | 276 | 670 | 494
Income impact of assumed conversions | 0 | 0 | 0 | 0
Income from continuing operations available to common shareholders and assumed conversions | $ 392 | $ 276 | $ 670 | $ 494
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 | 1,000,000 | 1,000,000 | 1,000,000
Adjusted weighted average shares - diluted (in shares) | 327,000,000 | 327,000,000 | 327,000,000 | 327,000,000
Diluted earnings per share - continuing operations (in dollars per share) | $ 1.20 | $ 0.84 | $ 2.05 | $ 1.51
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) | 7,426,319 | 6,223,964 | 7,435,580 | 6,223,964

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