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Earnings (Loss) Per Share Of Common Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share [Abstract]
Net Income (Loss)	$ 396	$ 380	$ 775	$ (381)
Weighted average number of basic shares outstanding	444	425	444	425
Assumed exercise of dilutive stock options and awards (in shares)	2	2	1	0
Weighted average number of diluted shares outstanding	446	427	445	425
Basic earnings (loss) per share of common stock (in dollars per share)	$ 0.89	$ 0.89	$ 1.75	$ (0.90)
Diluted earnings (loss) per share of common stock (in dollars per share)	$ 0.89	$ 0.89	$ 1.74	$ (0.90)
Shares excluded from the calculation of diluted shares outstanding, in shares	1	3	1	3

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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