Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended
Mar. 31, 2011
Summary of Significant Accounting Policies
Percentage of equity interest sold in STARS	50.10%
Sale price of STARS equity interest	$ 35
Retained equity interest in STARS (as a percent)	49.90%
Gain on sale of STARS	$ 68

- Definition

The amount of the gain (loss) recognized by the parent and included in its attributable portion of net income for the period due to deconsolidation of a subsidiary or derecognition of a group of assets. The gain (loss) recognized and included in the net income attributable to the parent for the period is generally computed as the difference between: (a) the aggregate of: (1) the fair value of any consideration received; (2) the fair value of any retained noncontrolling investment in the former subsidiary at the date the subsidiary was deconsolidated; and (3) the carrying amount of any noncontrolling interest in the former subsidiary (including any accumulated other comprehensive income attributable to the noncontrolling interest) at the date the subsidiary was deconsolidated and (b) the carrying amount of the former subsidiary's assets and liabilities.

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