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Benefit Plans Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Fair Value, Inputs, Level 1
Sep. 30, 2012
Fair Value, Inputs, Level 1
Sep. 30, 2013
Fair Value, Inputs, Level 2
Sep. 30, 2012
Fair Value, Inputs, Level 2
Sep. 30, 2013
Fair Value, Inputs, Level 3
Sep. 30, 2012
Fair Value, Inputs, Level 3
Sep. 30, 2011
Fair Value, Inputs, Level 3
Sep. 30, 2013
Equity securities
Sep. 30, 2012
Equity securities
Sep. 30, 2013
Equity securities
Fair Value, Inputs, Level 1
Sep. 30, 2012
Equity securities
Fair Value, Inputs, Level 1
Sep. 30, 2013
Equity securities
Fair Value, Inputs, Level 2
Sep. 30, 2012
Equity securities
Fair Value, Inputs, Level 2
Sep. 30, 2013
Equity securities
Fair Value, Inputs, Level 3
Sep. 30, 2012
Equity securities
Fair Value, Inputs, Level 3
Sep. 30, 2013
Preferred securities [Member]
Sep. 30, 2012
Preferred securities [Member]
Sep. 30, 2013
Preferred securities [Member]
Fair Value, Inputs, Level 1
Sep. 30, 2012
Preferred securities [Member]
Fair Value, Inputs, Level 1
Sep. 30, 2013
Preferred securities [Member]
Fair Value, Inputs, Level 2
Sep. 30, 2012
Preferred securities [Member]
Fair Value, Inputs, Level 2
Sep. 30, 2013
Preferred securities [Member]
Fair Value, Inputs, Level 3
Sep. 30, 2012
Preferred securities [Member]
Fair Value, Inputs, Level 3
Sep. 30, 2013
Corporate debt securities
Sep. 30, 2012
Corporate debt securities
Sep. 30, 2013
Corporate debt securities
Fair Value, Inputs, Level 1
Sep. 30, 2012
Corporate debt securities
Fair Value, Inputs, Level 1
Sep. 30, 2013
Corporate debt securities
Fair Value, Inputs, Level 2
Sep. 30, 2012
Corporate debt securities
Fair Value, Inputs, Level 2
Sep. 30, 2013
Corporate debt securities
Fair Value, Inputs, Level 3
Sep. 30, 2012
Corporate debt securities
Fair Value, Inputs, Level 3
Sep. 30, 2013
Residential mortgage-backed securities
Sep. 30, 2012
Residential mortgage-backed securities
Sep. 30, 2013
Residential mortgage-backed securities
Fair Value, Inputs, Level 1
Sep. 30, 2012
Residential mortgage-backed securities
Fair Value, Inputs, Level 1
Sep. 30, 2013
Residential mortgage-backed securities
Fair Value, Inputs, Level 2
Sep. 30, 2012
Residential mortgage-backed securities
Fair Value, Inputs, Level 2
Sep. 30, 2013
Residential mortgage-backed securities
Fair Value, Inputs, Level 3
Sep. 30, 2012
Residential mortgage-backed securities
Fair Value, Inputs, Level 3
Sep. 30, 2013
Debt securities issued by U.S. Treasury and other U.S. government agencies
Sep. 30, 2012
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
Fair Value, Inputs, Level 1
Sep. 30, 2012
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 2
Sep. 30, 2012
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 3
Sep. 30, 2012
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 foreign governments
Sep. 30, 2012
Debt securities issued by foreign governments
Sep. 30, 2013
Debt securities issued by foreign governments
Fair Value, Inputs, Level 1
Sep. 30, 2012
Debt securities issued by foreign governments
Fair Value, Inputs, Level 1
Sep. 30, 2013
Debt securities issued by foreign governments
Fair Value, Inputs, Level 2
Sep. 30, 2012
Debt securities issued by foreign governments
Fair Value, Inputs, Level 2
Sep. 30, 2013
Debt securities issued by foreign governments
Fair Value, Inputs, Level 3
Sep. 30, 2012
Debt securities issued by foreign governments
Fair Value, Inputs, Level 3
Sep. 30, 2013
Asset-backed securities
Sep. 30, 2012
Asset-backed securities
Sep. 30, 2013
Asset-backed securities
Fair Value, Inputs, Level 1
Sep. 30, 2012
Asset-backed securities
Fair Value, Inputs, Level 1
Sep. 30, 2013
Asset-backed securities
Fair Value, Inputs, Level 2
Sep. 30, 2012
Asset-backed securities
Fair Value, Inputs, Level 2
Sep. 30, 2013
Asset-backed securities
Fair Value, Inputs, Level 3
Sep. 30, 2012
Asset-backed securities
Fair Value, Inputs, Level 3
Sep. 30, 2013
Debt securities issued by state/local governments
Sep. 30, 2012
Debt securities issued by state/local governments
Sep. 30, 2013
Debt securities issued by state/local governments
Fair Value, Inputs, Level 1
Sep. 30, 2012
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 2
Sep. 30, 2012
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 3
Sep. 30, 2012
Debt securities issued by state/local governments
Fair Value, Inputs, Level 3
Sep. 30, 2013
Commercial mortgage-backed securities
Sep. 30, 2012
Commercial mortgage-backed securities
Sep. 30, 2013
Commercial mortgage-backed securities
Fair Value, Inputs, Level 1
Sep. 30, 2012
Commercial mortgage-backed securities
Fair Value, Inputs, Level 1
Sep. 30, 2013
Commercial mortgage-backed securities
Fair Value, Inputs, Level 2
Sep. 30, 2012
Commercial mortgage-backed securities
Fair Value, Inputs, Level 2
Sep. 30, 2013
Commercial mortgage-backed securities
Fair Value, Inputs, Level 3
Sep. 30, 2012
Commercial mortgage-backed securities
Fair Value, Inputs, Level 3
Sep. 30, 2013
Equity security commingled funds
Sep. 30, 2012
Equity security commingled funds
Sep. 30, 2013
Equity security commingled funds
Fair Value, Inputs, Level 1
Sep. 30, 2012
Equity security commingled funds
Fair Value, Inputs, Level 1
Sep. 30, 2013
Equity security commingled funds
Fair Value, Inputs, Level 2
Sep. 30, 2012
Equity security commingled funds
Fair Value, Inputs, Level 2
Sep. 30, 2013
Equity security commingled funds
Fair Value, Inputs, Level 3
Sep. 30, 2012
Equity security commingled funds
Fair Value, Inputs, Level 3
Sep. 30, 2013
Debt security commingled funds
Sep. 30, 2012
Debt security commingled funds
Sep. 30, 2013
Debt security commingled funds
Fair Value, Inputs, Level 1
Sep. 30, 2012
Debt security commingled funds
Fair Value, Inputs, Level 1
Sep. 30, 2013
Debt security commingled funds
Fair Value, Inputs, Level 2
Sep. 30, 2012
Debt security commingled funds
Fair Value, Inputs, Level 2
Sep. 30, 2013
Debt security commingled funds
Fair Value, Inputs, Level 3
Sep. 30, 2012
Debt security commingled funds
Fair Value, Inputs, Level 3
Sep. 30, 2013
Blended security commingled funds
Sep. 30, 2012
Blended security commingled funds
Sep. 30, 2013
Blended security commingled funds
Fair Value, Inputs, Level 1
Sep. 30, 2012
Blended security commingled funds
Fair Value, Inputs, Level 1
Sep. 30, 2013
Blended security commingled funds
Fair Value, Inputs, Level 2
Sep. 30, 2012
Blended security commingled funds
Fair Value, Inputs, Level 2
Sep. 30, 2013
Blended security commingled funds
Fair Value, Inputs, Level 3
Sep. 30, 2012
Blended security commingled funds
Fair Value, Inputs, Level 3
Sep. 30, 2013
Institutional mutual funds
Sep. 30, 2012
Institutional mutual funds
Sep. 30, 2013
Institutional mutual funds
Fair Value, Inputs, Level 1
Sep. 30, 2012
Institutional mutual funds
Fair Value, Inputs, Level 1
Sep. 30, 2013
Institutional mutual funds
Fair Value, Inputs, Level 2
Sep. 30, 2012
Institutional mutual funds
Fair Value, Inputs, Level 2
Sep. 30, 2013
Institutional mutual funds
Fair Value, Inputs, Level 3
Sep. 30, 2012
Institutional mutual funds
Fair Value, Inputs, Level 3
Sep. 30, 2013
Cash and cash equivalents
Sep. 30, 2012
Cash and cash equivalents
Sep. 30, 2013
Cash and cash equivalents
Fair Value, Inputs, Level 1
Sep. 30, 2012
Cash and cash equivalents
Fair Value, Inputs, Level 1
Sep. 30, 2013
Cash and cash equivalents
Fair Value, Inputs, Level 2
Sep. 30, 2012
Cash and cash equivalents
Fair Value, Inputs, Level 2
Sep. 30, 2013
Cash and cash equivalents
Fair Value, Inputs, Level 3
Sep. 30, 2012
Cash and cash equivalents
Fair Value, Inputs, Level 3
Sep. 30, 2013
Private equity funds
Sep. 30, 2012
Private equity funds
Sep. 30, 2013
Private equity funds
Fair Value, Inputs, Level 1
Sep. 30, 2012
Private equity funds
Fair Value, Inputs, Level 1
Sep. 30, 2013
Private equity funds
Fair Value, Inputs, Level 2
Sep. 30, 2012
Private equity funds
Fair Value, Inputs, Level 2
Sep. 30, 2013
Private equity funds
Fair Value, Inputs, Level 3
Sep. 30, 2012
Private equity funds
Fair Value, Inputs, Level 3
Sep. 30, 2013
Private real estate funds
Sep. 30, 2012
Private real estate funds
Sep. 30, 2013
Private real estate funds
Fair Value, Inputs, Level 1
Sep. 30, 2012
Private real estate funds
Fair Value, Inputs, Level 1
Sep. 30, 2013
Private real estate funds
Fair Value, Inputs, Level 2
Sep. 30, 2012
Private real estate funds
Fair Value, Inputs, Level 2
Sep. 30, 2013
Private real estate funds
Fair Value, Inputs, Level 3
Sep. 30, 2012
Private real estate funds
Fair Value, Inputs, Level 3
Sep. 30, 2013
Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral
Sep. 30, 2012
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
Fair Value, Inputs, Level 1
Sep. 30, 2012
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 2
Sep. 30, 2012
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 3
Sep. 30, 2012
Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral
Fair Value, Inputs, Level 3
Sep. 30, 2013
Securities lending commingled funds
Sep. 30, 2012
Securities lending commingled funds
Sep. 30, 2013
Securities lending commingled funds
Fair Value, Inputs, Level 1
Sep. 30, 2012
Securities lending commingled funds
Fair Value, Inputs, Level 1
Sep. 30, 2013
Securities lending commingled funds
Fair Value, Inputs, Level 2
Sep. 30, 2012
Securities lending commingled funds
Fair Value, Inputs, Level 2
Sep. 30, 2013
Securities lending commingled funds
Fair Value, Inputs, Level 3
Sep. 30, 2012
Securities lending commingled funds
Fair Value, Inputs, Level 3
Sep. 30, 2013
Foreign currency forward
Sep. 30, 2012
Foreign currency forward
Sep. 30, 2013
Foreign currency forward
Fair Value, Inputs, Level 1
Sep. 30, 2012
Foreign currency forward
Fair Value, Inputs, Level 1
Sep. 30, 2013
Foreign currency forward
Fair Value, Inputs, Level 2
Sep. 30, 2012
Foreign currency forward
Fair Value, Inputs, Level 2
Sep. 30, 2013
Foreign currency forward
Fair Value, Inputs, Level 3
Sep. 30, 2012
Foreign currency forward
Fair Value, Inputs, Level 3
Sep. 30, 2013
Interest rate swaps
Sep. 30, 2013
Interest rate swaps
Fair Value, Inputs, Level 1
Sep. 30, 2013
Interest rate swaps
Fair Value, Inputs, Level 2
Sep. 30, 2013
Interest rate swaps
Fair Value, Inputs, Level 3
Sep. 30, 2013
Options
Sep. 30, 2012
Options
Sep. 30, 2013
Options
Fair Value, Inputs, Level 1
Sep. 30, 2012
Options
Fair Value, Inputs, Level 1
Sep. 30, 2013
Options
Fair Value, Inputs, Level 2
Sep. 30, 2012
Options
Fair Value, Inputs, Level 2
Sep. 30, 2013
Options
Fair Value, Inputs, Level 3
Sep. 30, 2012
Options
Fair Value, Inputs, Level 3
Sep. 30, 2013
Futures
Sep. 30, 2012
Futures
Sep. 30, 2013
Futures
Fair Value, Inputs, Level 1
Sep. 30, 2012
Futures
Fair Value, Inputs, Level 1
Sep. 30, 2013
Futures
Fair Value, Inputs, Level 2
Sep. 30, 2012
Futures
Fair Value, Inputs, Level 2
Sep. 30, 2012
Futures
Fair Value, Inputs, Level 3
Sep. 30, 2013
Credit default swaps
Sep. 30, 2012
Credit default swaps
Sep. 30, 2013
Credit default swaps
Fair Value, Inputs, Level 1
Sep. 30, 2012
Credit default swaps
Fair Value, Inputs, Level 1
Sep. 30, 2013
Credit default swaps
Fair Value, Inputs, Level 2
Sep. 30, 2012
Credit default swaps
Fair Value, Inputs, Level 2
Sep. 30, 2013
Credit default swaps
Fair Value, Inputs, Level 3
Sep. 30, 2012
Credit default swaps
Fair Value, Inputs, Level 3
Sep. 30, 2013
Minimum
Number_of_extensions
Years
Sep. 30, 2013
Maximum
Years
Number_of_extensions
Defined Benefit Plan Disclosure                                                                                                                                                                                                                                                                                                                                                                                            
Fair value of gross plan assets $ 7,951 [1],[2] $ 7,666 [1],[3] $ 1,855 $ 1,530 $ 5,440 $ 5,503 $ 656 $ 633 $ 813 $ 1,689 [1],[2] $ 1,294 [1],[3] $ 1,686 $ 1,293 $ 0 $ 0 $ 3 $ 1 $ 22 [1],[2] $ 26 [1],[3] $ 17 $ 18 $ 0 $ 3 $ 5 $ 5 $ 1,352 [1],[2] $ 1,601 [1],[3] $ 0 $ 0 $ 1,334 $ 1,589 $ 18 $ 12 $ 355 [1],[2] $ 390 [1],[3] $ 0 $ 0 $ 352 $ 386 $ 3 $ 4 $ 113 [1],[2] $ 184 [1],[3] $ 113 $ 182 $ 0 $ 2 $ 0 $ 0 $ 31 [1],[2] $ 46 [1],[3] $ 0 $ 0 $ 30 $ 43 $ 1 $ 3 $ 120 [1],[2] $ 109 [1],[3] $ 0 $ 0 $ 110 $ 95 $ 10 $ 14 $ 36 [1],[2] $ 46 [1],[3] $ 0 $ 0 $ 36 $ 41 $ 0 $ 5 $ 21 [1],[2] $ 28 [1],[3] $ 0 $ 0 $ 18 $ 28 $ 3 $ 0 $ 1,182 [1],[2] $ 1,129 [1],[3] $ 0 $ 0 $ 1,182 $ 1,129 $ 0 $ 0 $ 786 [1],[2] $ 802 [1],[3] $ 0 $ 0 $ 786 $ 802 $ 0 $ 0 $ 263 [1],[2] $ 275 [1],[3] $ 0 $ 0 $ 263 $ 275 $ 0 $ 0 $ 26 [1],[2] $ 32 [1],[3] $ 26 $ 32 $ 0 $ 0 $ 0 $ 0 $ 395 [1],[2] $ 311 [1],[3] $ 1 $ 0 $ 394 $ 311 $ 0 $ 0 $ 528 [1],[2] $ 519 [1],[3] $ 0 $ 0 $ 0 $ 0 $ 528 $ 519 $ 382 [1],[2] $ 340 [1],[3] $ 0 $ 0 $ 297 $ 270 $ 85 $ 70 $ 39 [1],[2] $ 37 [1],[3] $ 8 $ 5 $ 31 $ 32 $ 0 $ 0 $ 3 [1],[2] $ 3 [1],[3] $ 0 $ 0 $ 3 $ 3 $ 0 $ 0 $ 594 [1],[2] $ 487 [1],[3] $ 0 $ 0 $ 594 $ 487 $ 0 $ 0 $ 4 [1],[2] $ 0 $ 4 $ 0 $ 6 [1],[2] $ 7 [1],[3] $ 0 $ 0 $ 6 $ 7 $ 0 $ 0 $ 4 [1],[2]   $ 4   $ 0                        
Derivative liabilities 596 [1],[2] 493 [1],[3] 0 3 596 490 0 0                                                                                                                                                                                                                                                                                                   594 [1],[2] 488 [1],[3] 0 0 594 488 0 0         1 [1],[2] 1 [1],[3] 0 0 1 1 0 0   3 [1],[3]   3   0 0 1 [1],[2] 1 [1],[3] 0 0 1 1 0 0    
Net payables 131 141                                                                                                                                                                                                                                                                                                                                                                                        
Payables for collateral on loaned securities $ 3 $ 3                                                                                                                                                                                                                                                                                                                                                                                        
Inter-vendor pricing variance 2.00%                                                                                                                                                                                                                                                                                                                                                                                          
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 a $3 million payable for collateral on loaned securities in connection with TVARS’s participation in securities lending programs.
[2] Excludes approximately $131 million in net payables associated with security purchases and sales and various other payables.
[3] Excludes approximately $141 million in net payables associated with security purchases and sales and various other payables