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Common Shareholders' Equity (Stock-Based Compensation) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-based compensation
Stock based compensation costs	$ 57	$ 49	$ 57
Tax benefits related to stock-based compensation arrangements	22	19	22
Unrecognized stock based compensation costs	$ 53
Unrecognized stock based compensation costs weighted-average period of recognition (in years)	2 years 1 month 6 days
Common stock authorized for awards (in shares)	20,000,000

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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