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Earnings Per Common Share (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Numerator (basic and diluted):
Income from continuing operations	$ 542	$ 111	$ 758	$ 256
Less: Allocation to unvested restricted stock awards	(11)	(2)	(15)	(5)
Income from continuing operations attributable to common shareholders	531	109	743	251
Income (loss) from discontinued operations, net	1	(2)	(2)	(16)
Income (loss) from discontinued operations attributable to common shareholders	1	(2)	(2)	(16)
Net income available to common shareholders	$ 532	$ 107	$ 741	$ 235
Denominator:
Basic common shares (based upon weighted average) (in shares)	350	349	350	349
Add:
Stock option dilution (in shares)	3	3	3	3
Diluted common shares (in shares)	353	352	353	352

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Income Loss From Discontinued Operations Attributable To Common Stockholders

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(Loss) income from continuing operations attributable to common shareholders.

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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Earnings allocated (not distributed) to participating securities under the two-class method to the extent that participating securities may share in earnings as if all of the earnings for the period had been distributed.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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