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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, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Basic earnings per share: |  |  |  |
Income from operations attributable to common shareholders | $ 471 | $ 513 | $ 1,141 | $ 1,007
Participating securities dividends | 0 | 0 | 0 | 0
Net income available to common shareholders | $ 471 | $ 513 | $ 1,141 | $ 1,007
Weighted average common shares outstanding (in shares) | 347,000,000 | 326,000,000 | 333,000,000 | 326,000,000
Basic earnings per share - continuing operations (in dollars per share) | $ 1.36 | $ 1.57 | $ 3.43 | $ 3.09
Diluted earnings per share: |  |  |  |
Income from operations attributable to common shareholders | $ 471 | $ 513 | $ 1,141 | $ 1,007
Participating securities dividends | 0 | 0 | 0 | 0
Net income available to common shareholders | 471 | 513 | 1,141 | 1,007
Income impact of assumed conversions | 0 | 0 | 0 | 0
Net income available to common shareholders and assumed conversions | $ 471 | $ 513 | $ 1,141 | $ 1,007
Weighted average common shares outstanding (in shares) | 347,000,000 | 326,000,000 | 333,000,000 | 326,000,000
Incremental shares from assumed conversions (in shares) | 2,000,000 | 1,000,000 | 1,000,000 | 1,000,000
Adjusted weighted average shares - diluted (in shares) | 349,000,000 | 327,000,000 | 334,000,000 | 327,000,000
Diluted earnings per share - continuing operations (in dollars per share) | $ 1.35 | $ 1.57 | $ 3.42 | $ 3.08
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) | 1,398,884 | 3,817,072 | 5,997,917 | 6,042,695

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