Accounting and Reporting Developments Change in Depreciable Lives (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Depreciation and amortization	$ 30	$ 45	$ 64	$ 87
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	155	157	222	247
Diluted earnings per share	$ 0.93	$ 0.89	$ 1.21	$ 1.35
Service Life [Member]
Depreciation and amortization	14		24
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	$ 11		$ 18
Diluted earnings per share	$ 0.08		$ 0.13

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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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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