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Stock-based Compensation - Non-cash compensation expensed and capitalized (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Stock-based compensation expense
Stock- based compensation expense	$ 24	$ 25
Capitalized Noncash Compensation	0	0
Non-cash compensation expense	24	25
Number of OSOs outstanding as of the balance sheet date	1.0
Number of RSUs outstanding as of balance sheet date	2
Outperform Stock Options
Stock-based compensation expense
Stock- based compensation expense	2	2
Restricted Stock Units and Shares
Stock-based compensation expense
Stock- based compensation expense	4	4
401(k) Match Expense
Stock-based compensation expense
Stock- based compensation expense	7	3
Restricted Stock Unit Bonus Grant
Stock-based compensation expense
Stock- based compensation expense	$ 11	$ 16
Non Qualified Stock Options
Stock-based compensation expense
Number of OSOs outstanding as of the balance sheet date	0.5

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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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- Definition

The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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