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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended				1 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Performance-base restricted stock [Member]	Jun. 30, 2012 Restricted Stock [Member]	Feb. 21, 2012 Restricted Stock and Restricted Stock Units [Member]	Jun. 30, 2012 Restricted Stock and Restricted Stock Units [Member]	Jun. 30, 2012 Non Employee [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option granted			2,239,088
Restricted stock granted					148,550		464,270	482,428	18,158
Total stock-based compensation compensation arrangements under the Plan	$ 22	$ 19	$ 34	$ 36	$ (8)
Period of Restricted stock awards vested over grant date						Restricted stock awards vest on the third anniversary of the date of grant
Stock Based Compensation (Textual) [Abstract]
Earlier authorized shares under stock based compensation			25,500,000
Remaining shares available for future grants under the Plan	3,496,443		3,496,443
Total income tax benefit stock-based compensation arrangements under the Plan	$ 8	$ 6	$ 11	$ 11
Stock option granted, exercise price			$ 84.58
Performance based restricted stock awards granted in percent			100.00%
Performance based restricted stock awards vested, number of months			36 months

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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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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Net number of share options (or share units) granted during the period.

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