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Fair Value Measurements Investments Gains (Losses) (Details) (USD $)	3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Investment Gains (Losses)
Securities classified as trading and measured at fair value	$ 1,500,000,000
Equity investments not required to be measured at fair value	2,000,000
NDT unfunded commitments related to private partnerships	208,000,000
SERP
Investment Gains (Losses)
Unrealized gains (losses) on investments	0	1,000,000
NDT
Investment Gains (Losses)
Unrealized gains (losses) on investments	13,000,000	58,000,000
ART
Investment Gains (Losses)
Unrealized gains (losses) on investments	$ 4,000,000	$ 9,000,000

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents commitments outstanding as of the balance sheet date which obligate or represent potential claims against the assets of the Company relating to, for example, the extension of credit. Further, commitments generally represent off balance sheet arrangements that obligate the entity to deliver assets or services or enter into another obligation in the future.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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- Definition

The total of financial instruments that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt and equity securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of investments, not including unrealized gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, held at each balance sheet date and included in earnings for the period.

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