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Description of the Company and Basis of Presentation (Schedule of Changes in Accounting Policy Regarding Pension and Other Postretirement Benefits - Consolidated Balance Sheets) (Details) (USD $)
In Millions, unless otherwise specified

Sep. 30, 2013

Dec. 31, 2012

As Previously Reported [Member]

Dec. 31, 2012

Effect of Change [Member]

Dec. 31, 2011

Effect of Change [Member]

New Accounting Pronouncements or Change in Accounting Principle [Line Items]

Retained earnings

$ 2,385

$ 1,993

^[1]

$ 2,986

$ (993)

$ 760

Accumulated other comprehensive income (loss), net

$ (47)

$ (89)

^[1]

$ (1,082)

$ 993

[1]	As Adjusted (Note 1)

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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