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Benefit Plans Fair Value Measurements (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Fair Value, Inputs, Level 1 | Sep. 30, 2013 Fair Value, Inputs, Level 1 | Sep. 30, 2014 Fair Value, Inputs, Level 2 | Sep. 30, 2013 Fair Value, Inputs, Level 2 | Sep. 30, 2014 Fair Value, Inputs, Level 3 | Sep. 30, 2013 Fair Value, Inputs, Level 3 | Sep. 30, 2012 Fair Value, Inputs, Level 3 | Sep. 30, 2014 Equity securities | Sep. 30, 2013 Equity securities | Sep. 30, 2014 Equity securities Fair Value, Inputs, Level 1 | Sep. 30, 2013 Equity securities Fair Value, Inputs, Level 1 | Sep. 30, 2014 Equity securities Fair Value, Inputs, Level 2 | Sep. 30, 2013 Equity securities Fair Value, Inputs, Level 2 | Sep. 30, 2014 Equity securities Fair Value, Inputs, Level 3 | Sep. 30, 2013 Equity securities Fair Value, Inputs, Level 3 | Sep. 30, 2014 Preferred securities [Member] | Sep. 30, 2013 Preferred securities [Member] | Sep. 30, 2014 Preferred securities [Member] Fair Value, Inputs, Level 1 | Sep. 30, 2013 Preferred securities [Member] Fair Value, Inputs, Level 1 | Sep. 30, 2014 Preferred securities [Member] Fair Value, Inputs, Level 2 | Sep. 30, 2013 Preferred securities [Member] Fair Value, Inputs, Level 2 | Sep. 30, 2014 Preferred securities [Member] Fair Value, Inputs, Level 3 | Sep. 30, 2013 Preferred securities [Member] Fair Value, Inputs, Level 3 | Sep. 30, 2014 Corporate debt securities | Sep. 30, 2013 Corporate debt securities | Sep. 30, 2014 Corporate debt securities Fair Value, Inputs, Level 1 | Sep. 30, 2013 Corporate debt securities Fair Value, Inputs, Level 1 | Sep. 30, 2014 Corporate debt securities Fair Value, Inputs, Level 2 | Sep. 30, 2013 Corporate debt securities Fair Value, Inputs, Level 2 | Sep. 30, 2014 Corporate debt securities Fair Value, Inputs, Level 3 | Sep. 30, 2013 Corporate debt securities Fair Value, Inputs, Level 3 | Sep. 30, 2014 Residential mortgage-backed securities | Sep. 30, 2013 Residential mortgage-backed securities | Sep. 30, 2014 Residential mortgage-backed securities Fair Value, Inputs, Level 1 | Sep. 30, 2013 Residential mortgage-backed securities Fair Value, Inputs, Level 1 | Sep. 30, 2014 Residential mortgage-backed securities Fair Value, Inputs, Level 2 | Sep. 30, 2013 Residential mortgage-backed securities Fair Value, Inputs, Level 2 | Sep. 30, 2014 Residential mortgage-backed securities Fair Value, Inputs, Level 3 | Sep. 30, 2013 Residential mortgage-backed securities Fair Value, Inputs, Level 3 | Sep. 30, 2014 Debt securities issued by U.S. Treasury and other U.S. government agencies | Sep. 30, 2013 Debt securities issued by U.S. Treasury and other U.S. government agencies | Sep. 30, 2014 Debt securities issued by U.S. Treasury and other U.S. government agencies Fair Value, Inputs, Level 1 | Sep. 30, 2013 Debt securities issued by U.S. Treasury and other U.S. government agencies Fair Value, Inputs, Level 1 | Sep. 30, 2014 Debt securities issued by U.S. Treasury and other U.S. government agencies Fair Value, Inputs, Level 2 | Sep. 30, 2013 Debt securities issued by U.S. Treasury and other U.S. government agencies Fair Value, Inputs, Level 2 | Sep. 30, 2014 Debt securities issued by U.S. Treasury and other U.S. government agencies Fair Value, Inputs, Level 3 | Sep. 30, 2013 Debt securities issued by U.S. Treasury and other U.S. government agencies Fair Value, Inputs, Level 3 | Sep. 30, 2014 Debt securities issued by foreign governments | Sep. 30, 2013 Debt securities issued by foreign governments | Sep. 30, 2014 Debt securities issued by foreign governments Fair Value, Inputs, Level 1 | Sep. 30, 2013 Debt securities issued by foreign governments Fair Value, Inputs, Level 1 | Sep. 30, 2014 Debt securities issued by foreign governments Fair Value, Inputs, Level 2 | Sep. 30, 2013 Debt securities issued by foreign governments Fair Value, Inputs, Level 2 | Sep. 30, 2014 Debt securities issued by foreign governments Fair Value, Inputs, Level 3 | Sep. 30, 2013 Debt securities issued by foreign governments Fair Value, Inputs, Level 3 | Sep. 30, 2014 Asset-backed securities | Sep. 30, 2013 Asset-backed securities | Sep. 30, 2014 Asset-backed securities Fair Value, Inputs, Level 1 | Sep. 30, 2013 Asset-backed securities Fair Value, Inputs, Level 1 | Sep. 30, 2014 Asset-backed securities Fair Value, Inputs, Level 2 | Sep. 30, 2013 Asset-backed securities Fair Value, Inputs, Level 2 | Sep. 30, 2014 Asset-backed securities Fair Value, Inputs, Level 3 | Sep. 30, 2013 Asset-backed securities Fair Value, Inputs, Level 3 | Sep. 30, 2014 Debt securities issued by state/local governments | Sep. 30, 2013 Debt securities issued by state/local governments | Sep. 30, 2014 Debt securities issued by state/local governments Fair Value, Inputs, Level 1 | Sep. 30, 2013 Debt securities issued by state/local governments Fair Value, Inputs, Level 1 | Sep. 30, 2014 Debt securities issued by state/local governments Fair Value, Inputs, Level 2 | Sep. 30, 2013 Debt securities issued by state/local governments Fair Value, Inputs, Level 2 | Sep. 30, 2014 Debt securities issued by state/local governments Fair Value, Inputs, Level 3 | Sep. 30, 2013 Debt securities issued by state/local governments Fair Value, Inputs, Level 3 | Sep. 30, 2014 Commercial mortgage-backed securities | Sep. 30, 2013 Commercial mortgage-backed securities | Sep. 30, 2014 Commercial mortgage-backed securities Fair Value, Inputs, Level 1 | Sep. 30, 2013 Commercial mortgage-backed securities Fair Value, Inputs, Level 1 | Sep. 30, 2014 Commercial mortgage-backed securities Fair Value, Inputs, Level 2 | Sep. 30, 2013 Commercial mortgage-backed securities Fair Value, Inputs, Level 2 | Sep. 30, 2014 Commercial mortgage-backed securities Fair Value, Inputs, Level 3 | Sep. 30, 2013 Commercial mortgage-backed securities Fair Value, Inputs, Level 3 | Sep. 30, 2014 Equity security commingled funds | Sep. 30, 2013 Equity security commingled funds | Sep. 30, 2014 Equity security commingled funds Fair Value, Inputs, Level 1 | Sep. 30, 2013 Equity security commingled funds Fair Value, Inputs, Level 1 | Sep. 30, 2014 Equity security commingled funds Fair Value, Inputs, Level 2 | Sep. 30, 2013 Equity security commingled funds Fair Value, Inputs, Level 2 | Sep. 30, 2014 Equity security commingled funds Fair Value, Inputs, Level 3 | Sep. 30, 2013 Equity security commingled funds Fair Value, Inputs, Level 3 | Sep. 30, 2014 Debt security commingled funds | Sep. 30, 2013 Debt security commingled funds | Sep. 30, 2014 Debt security commingled funds Fair Value, Inputs, Level 1 | Sep. 30, 2013 Debt security commingled funds Fair Value, Inputs, Level 1 | Sep. 30, 2014 Debt security commingled funds Fair Value, Inputs, Level 2 | Sep. 30, 2013 Debt security commingled funds Fair Value, Inputs, Level 2 | Sep. 30, 2014 Debt security commingled funds Fair Value, Inputs, Level 3 | Sep. 30, 2013 Debt security commingled funds Fair Value, Inputs, Level 3 | Sep. 30, 2014 Commodity commingled funds | Sep. 30, 2014 Commodity commingled funds Fair Value, Inputs, Level 1 | Sep. 30, 2014 Commodity commingled funds Fair Value, Inputs, Level 2 | Sep. 30, 2014 Commodity commingled funds Fair Value, Inputs, Level 3 | Sep. 30, 2014 Blended security commingled funds | Sep. 30, 2013 Blended security commingled funds | Sep. 30, 2014 Blended security commingled funds Fair Value, Inputs, Level 1 | Sep. 30, 2013 Blended security commingled funds Fair Value, Inputs, Level 1 | Sep. 30, 2014 Blended security commingled funds Fair Value, Inputs, Level 2 | Sep. 30, 2013 Blended security commingled funds Fair Value, Inputs, Level 2 | Sep. 30, 2014 Blended security commingled funds Fair Value, Inputs, Level 3 | Sep. 30, 2013 Blended security commingled funds Fair Value, Inputs, Level 3 | Sep. 30, 2014 Institutional mutual funds | Sep. 30, 2013 Institutional mutual funds | Sep. 30, 2014 Institutional mutual funds Fair Value, Inputs, Level 1 | Sep. 30, 2013 Institutional mutual funds Fair Value, Inputs, Level 1 | Sep. 30, 2014 Institutional mutual funds Fair Value, Inputs, Level 2 | Sep. 30, 2013 Institutional mutual funds Fair Value, Inputs, Level 2 | Sep. 30, 2014 Institutional mutual funds Fair Value, Inputs, Level 3 | Sep. 30, 2013 Institutional mutual funds Fair Value, Inputs, Level 3 | Sep. 30, 2014 Cash and cash equivalents | Sep. 30, 2013 Cash and cash equivalents | Sep. 30, 2014 Cash and cash equivalents Fair Value, Inputs, Level 1 | Sep. 30, 2013 Cash and cash equivalents Fair Value, Inputs, Level 1 | Sep. 30, 2014 Cash and cash equivalents Fair Value, Inputs, Level 2 | Sep. 30, 2013 Cash and cash equivalents Fair Value, Inputs, Level 2 | Sep. 30, 2014 Cash and cash equivalents Fair Value, Inputs, Level 3 | Sep. 30, 2013 Cash and cash equivalents Fair Value, Inputs, Level 3 | Sep. 30, 2014 Certificates of deposit | Sep. 30, 2014 Certificates of deposit Fair Value, Inputs, Level 1 | Sep. 30, 2014 Certificates of deposit Fair Value, Inputs, Level 2 | Sep. 30, 2014 Certificates of deposit Fair Value, Inputs, Level 3 | Sep. 30, 2014 Private equity funds | Sep. 30, 2013 Private equity funds | Sep. 30, 2014 Private equity funds Fair Value, Inputs, Level 1 | Sep. 30, 2013 Private equity funds Fair Value, Inputs, Level 1 | Sep. 30, 2014 Private equity funds Fair Value, Inputs, Level 2 | Sep. 30, 2013 Private equity funds Fair Value, Inputs, Level 2 | Sep. 30, 2014 Private equity funds Fair Value, Inputs, Level 3 | Sep. 30, 2013 Private equity funds Fair Value, Inputs, Level 3 | Sep. 30, 2014 Private real estate funds | Sep. 30, 2013 Private real estate funds | Sep. 30, 2014 Private real estate funds Fair Value, Inputs, Level 1 | Sep. 30, 2013 Private real estate funds Fair Value, Inputs, Level 1 | Sep. 30, 2014 Private real estate funds Fair Value, Inputs, Level 2 | Sep. 30, 2013 Private real estate funds Fair Value, Inputs, Level 2 | Sep. 30, 2014 Private real estate funds Fair Value, Inputs, Level 3 | Sep. 30, 2013 Private real estate funds Fair Value, Inputs, Level 3 | Sep. 30, 2014 Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral | Sep. 30, 2013 Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral | Sep. 30, 2014 Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral Fair Value, Inputs, Level 1 | Sep. 30, 2013 Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral Fair Value, Inputs, Level 1 | Sep. 30, 2014 Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral Fair Value, Inputs, Level 2 | Sep. 30, 2013 Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral Fair Value, Inputs, Level 2 | Sep. 30, 2014 Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral Fair Value, Inputs, Level 3 | Sep. 30, 2013 Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral Fair Value, Inputs, Level 3 | Sep. 30, 2014 Securities lending commingled funds | Sep. 30, 2013 Securities lending commingled funds | Sep. 30, 2014 Securities lending commingled funds Fair Value, Inputs, Level 1 | Sep. 30, 2013 Securities lending commingled funds Fair Value, Inputs, Level 1 | Sep. 30, 2014 Securities lending commingled funds Fair Value, Inputs, Level 2 | Sep. 30, 2013 Securities lending commingled funds Fair Value, Inputs, Level 2 | Sep. 30, 2014 Securities lending commingled funds Fair Value, Inputs, Level 3 | Sep. 30, 2013 Securities lending commingled funds Fair Value, Inputs, Level 3 | Sep. 30, 2014 Purchased options | Sep. 30, 2013 Purchased options | Sep. 30, 2014 Purchased options Fair Value, Inputs, Level 1 | Sep. 30, 2013 Purchased options Fair Value, Inputs, Level 1 | Sep. 30, 2014 Purchased options Fair Value, Inputs, Level 2 | Sep. 30, 2013 Purchased options Fair Value, Inputs, Level 2 | Sep. 30, 2014 Purchased options Fair Value, Inputs, Level 3 | Sep. 30, 2014 Foreign currency forward | Sep. 30, 2013 Foreign currency forward | Sep. 30, 2014 Foreign currency forward Fair Value, Inputs, Level 1 | Sep. 30, 2013 Foreign currency forward Fair Value, Inputs, Level 1 | Sep. 30, 2014 Foreign currency forward Fair Value, Inputs, Level 2 | Sep. 30, 2013 Foreign currency forward Fair Value, Inputs, Level 2 | Sep. 30, 2014 Foreign currency forward Fair Value, Inputs, Level 3 | Sep. 30, 2013 Foreign currency forward Fair Value, Inputs, Level 3 | Sep. 30, 2014 Futures | Sep. 30, 2014 Futures Fair Value, Inputs, Level 1 | Sep. 30, 2014 Futures Fair Value, Inputs, Level 2 | Sep. 30, 2014 Futures Fair Value, Inputs, Level 3 | Sep. 30, 2014 Written option obligations | Sep. 30, 2013 Written option obligations | Sep. 30, 2014 Written option obligations Fair Value, Inputs, Level 1 | Sep. 30, 2013 Written option obligations Fair Value, Inputs, Level 1 | Sep. 30, 2014 Written option obligations Fair Value, Inputs, Level 2 | Sep. 30, 2013 Written option obligations Fair Value, Inputs, Level 2 | Sep. 30, 2014 Written option obligations Fair Value, Inputs, Level 3 | Sep. 30, 2013 Written option obligations Fair Value, Inputs, Level 3 | Sep. 30, 2013 Credit default swaps | Sep. 30, 2013 Credit default swaps Fair Value, Inputs, Level 1 | Sep. 30, 2013 Credit default swaps Fair Value, Inputs, Level 2 | Sep. 30, 2013 Credit default swaps Fair Value, Inputs, Level 3 | Sep. 30, 2014 Minimum Number_of_extensions Years | Sep. 30, 2014 Maximum Years Number_of_extensions
Defined Benefit Plan Disclosure |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of gross plan assets | $ 7,600 | [1],[2] | $ 7,363 | $ 1,804 | $ 1,855 | $ 5,148 | $ 4,852 | $ 648 | $ 656 | $ 633 | $ 1,669 | $ 1,689 | $ 1,668 | $ 1,686 | $ 0 | $ 0 | $ 1 | $ 3 | $ 37 | $ 22 | $ 5 | $ 17 | $ 32 | $ 0 | $ 0 | $ 5 | $ 1,326 | $ 1,352 | $ 0 | $ 0 | $ 1,304 | $ 1,334 | $ 22 | $ 18 | $ 204 | $ 355 | $ 0 | $ 0 | $ 201 | $ 352 | $ 3 | $ 3 | $ 93 | $ 113 | $ 93 | $ 113 | $ 0 | $ 0 | $ 0 | $ 0 | $ 225 | $ 31 | $ 0 | $ 0 | $ 218 | $ 30 | $ 7 | $ 1 | $ 176 | $ 120 | $ 0 | $ 0 | $ 147 | $ 110 | $ 29 | $ 10 | $ 30 | $ 36 | $ 0 | $ 0 | $ 29 | $ 36 | $ 1 | $ 0 | $ 23 | $ 21 | $ 0 | $ 0 | $ 20 | $ 18 | $ 3 | $ 3 | $ 1,106 | $ 1,182 | $ 0 | $ 0 | $ 1,106 | $ 1,182 | $ 0 | $ 0 | $ 661 | $ 786 | $ 0 | $ 0 | $ 661 | $ 786 | $ 0 | $ 0 | $ 332 | $ 0 | $ 332 | $ 0 | $ 228 | $ 263 | $ 0 | $ 0 | $ 228 | $ 263 | $ 0 | $ 0 | $ 28 | $ 26 | $ 28 | $ 26 | $ 0 | $ 0 | $ 0 | $ 0 | $ 464 | $ 395 | $ 0 | $ 1 | $ 464 | $ 394 | $ 0 | $ 0 | $ 19 | $ 0 | $ 19 | $ 0 | $ 481 | $ 528 | $ 0 | $ 0 | $ 0 | $ 0 | $ 481 | $ 528 | $ 435 | $ 382 | $ 0 | $ 0 | $ 334 | $ 297 | $ 101 | $ 85 | $ 35 | $ 39 | $ 10 | $ 8 | $ 25 | $ 31 | $ 0 | $ 0 | $ 2 | $ 3 | $ 0 | $ 0 | $ 2 | $ 3 | $ 0 | $ 0 | $ 18 | $ 6 | $ 0 | $ 0 | $ 18 | $ 6 | $ 0 | $ 8 | $ 6 | $ 0 | $ 0 | $ 8 | $ 6 | $ 0 | $ 0 |  |  |  |  |  | $ 4 |  | $ 4 |  | $ 0 |  | $ 0 | $ 4 | $ 0 | $ 4 |  |  |
Derivative liabilities | 26 | [1],[3] | 8 | 11 | 0 | 15 | 8 | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8 | 6 | 0 | 0 | 8 | 6 | 0 | 0 | 11 | 11 | 0 | 0 | 7 | 1 | 0 | 0 | 7 | 1 | 0 | 0 | 1 | 0 | 1 | 0 |  |
Net payables | 65 |  | 131 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payables for collateral on loaned securities | $ 2 |  | $ 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of years partnerships in private equity generally continue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 | 12
Number of one year extensions for partnerships in private equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 | 4
Voting percentage required to desolve partnership in private equity | 80.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Excludes approximately $65 million in net payables associated with security purchases and sales and various other payables.
[2] | Excludes a $3 million payable for collateral on loaned securities in connection with TVARS’s participation in securities lending programs.
[3] | Excludes a $2 million payable for collateral on loaned securities in connection with TVARS’s participation in securities lending programs.

X
- Definition Fair value of liabilities as of the measurement date resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements. These liabilities have been segregated and restricted (usually in a trust) for the purpose of defined benefit plan benefits. + References No definition available. + Details
Name: | tve_DefinedBenefitPlanFairValueOfPlanDerivativeLiabilities
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. This amount is not reduced by non-benefit liabilities. + References No definition available. + Details
Name: | tve_FairValuePlanAssetsGross
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net payables associated with security purchases and sales and various other payables. + References No definition available. + Details
Name: | tve_NetPayables
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The number of one year extensions for partnerships in private equity stated in a range. + References No definition available. + Details
Name: | tve_Numberofoneyearextensionsforpartnershipsinprivateequity
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of years partnerships in private equity generally continue stated in a range. + References No definition available. + Details
Name: | tve_Numberofyearspartnershipsinprivateequitygenerallycontinue
Namespace Prefix: | tve_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Payables for collateral on loaned securities in connection with retirement system participation in securities lending program. + References No definition available. + Details
Name: | tve_PayablesForCollateralOnLoanedSecurities
Namespace Prefix: | tve_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The voting percentage required to desolve a partnership in private equity. + References No definition available. + Details
Name: | tve_Votingpercentagerequiredtodesolvepartnershipinprivateequity
Namespace Prefix: | tve_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration