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Benefit Plans Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 12 Months Ended
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.