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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended
	May 31, 2011	Feb. 28, 2011	Mar. 31, 2012	Mar. 31, 2011	May 19, 2011
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option granted	22,624	2,255,322	2,239,088
Restricted stock granted		234,620
Period of option vested over grant date			options generally vest over a three-year period from the grant date
Total stock-based compensation compensation arrangements under the Plan			$ 12	$ 17
Stock Based Compensation (Textual) [Abstract]
Earlier authorized shares under stock based compensation			25,500,000
Remaining shares available for future grants under the Plan			3,408,779	0
Total income tax benefit stock-based compensation arrangements under the Plan			3	5
Stock option granted, exercise price			$ 84.58		$ 67.93
Performance based restricted stock awards granted in percent			100.00%
Performance based restricted stock awards vested, number of months			36 months
Restricted stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Period of option vested over grant date			Restricted stock awards vest in equal thirds over three years on the anniversary of the grant date
Performance-base restricted stock [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted			148,550
Total stock-based compensation compensation arrangements under the Plan			$ 8
Non Employee [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted	8,505
Restricted Stock and Restricted Stock Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock granted			464,270

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Remaining shares available for future grants under the Plan.

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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 total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Description of award terms as to how many shares or portion of an award are no longer contingent on satisfaction of either a service condition, market condition or a performance condition, thereby giving the employee the legal right to convert the award to shares, to sell the shares, and be entitled to the cash proceeds of such sale. For example, vesting may be expressed as being 25 percent of the shares under option on each anniversary of the grant date.

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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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The weighted average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on stock options awarded under the plan during the reporting period.

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