Fair Value Measurements Investments Gains (Losses) (Details) (USD $)
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3 Months Ended | 9 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Investment Gains (Losses) | ||||
Securities classified as trading and measured at fair value | $ 1,900,000,000 | $ 1,900,000,000 | ||
Equity investments not required to be measured at fair value | 1,000,000 | 1,000,000 | ||
NDT unfunded commitments related to private partnerships | 128,000,000 | 128,000,000 | ||
SERP
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Investment Gains (Losses) | ||||
Unrealized gains (losses) on investments | 1,000,000 | (1,000,000) | 2,000,000 | 0 |
NDT
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Investment Gains (Losses) | ||||
Unrealized gains (losses) on investments | 36,000,000 | (42,000,000) | 72,000,000 | 16,000,000 |
ART
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Investment Gains (Losses) | ||||
Unrealized gains (losses) on investments | $ 9,000,000 | $ (6,000,000) | $ 27,000,000 | $ 16,000,000 |