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Accounting and Reporting Developments Change in Depreciable Lives (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Depreciation and amortization	$ 34	$ 46	$ 98	$ 133
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	127	344	349	591
Diluted earnings per share	$ 0.73	$ 2.20	$ 1.94	$ 3.53
Service Life [Member]
Depreciation and amortization	14		38
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 10		$ 28
Diluted earnings per share	$ 0.07		$ 0.20

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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