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Benefit Plans Fair Value Measurements (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2015
USD ($)
Years
Number_of_extensions
Sep. 30, 2014
USD ($)
Sep. 30, 2013
USD ($)
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] $ 6,964 [2] $ 7,600 [3]  
Derivative liabilities 34 [2],[4] 26 [1],[3]  
Net payables 130 65  
Payables for collateral on loaned securities $ 3 2  
Voting percentage required to desolve partnership in private equity 80.00%    
Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets $ 2,060 1,804  
Derivative liabilities 17 11  
Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 2,122 2,487  
Derivative liabilities 17 15  
Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 91 66 $ 42
Derivative liabilities 0 0  
Equity securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 1,650 1,669  
Equity securities | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 1,649 1,668  
Equity securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Equity securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 1 1  
Preferred securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 36 37  
Preferred securities | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 2 5  
Preferred securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 34 32  
Preferred securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Corporate debt securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 1,161 1,326  
Corporate debt securities | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Corporate debt securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 1,149 1,304  
Corporate debt securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 12 22  
Residential mortgage-backed securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 151 204  
Residential mortgage-backed securities | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Residential mortgage-backed securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 138 201  
Residential mortgage-backed securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 13 3  
Debt securities issued by U.S. Treasury and other U.S. government agencies      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 362 93  
Debt securities issued by U.S. Treasury and other U.S. government agencies | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 362 93  
Debt securities issued by U.S. Treasury and other U.S. government agencies | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Debt securities issued by U.S. Treasury and other U.S. government agencies | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Debt securities issued by foreign governments      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 294 225  
Debt securities issued by foreign governments | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Debt securities issued by foreign governments | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 281 218  
Debt securities issued by foreign governments | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 13 7  
Asset-backed securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 156 176  
Asset-backed securities | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Asset-backed securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 116 147  
Asset-backed securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 40 29  
Debt securities issued by state/local governments      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 25 30  
Debt securities issued by state/local governments | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Debt securities issued by state/local governments | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 25 29  
Debt securities issued by state/local governments | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 1  
Commercial mortgage-backed securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 43 23  
Commercial mortgage-backed securities | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Commercial mortgage-backed securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 32 20  
Commercial mortgage-backed securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 11 3  
Equity security commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 642 1,106  
Equity security commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Equity security commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Equity security commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Debt security commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 654 661  
Debt security commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Debt security commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Debt security commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Commodity commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 244 332  
Commodity commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Commodity commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Commodity commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Blended security commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 206 228  
Blended security commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Blended security commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Blended security commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Institutional mutual funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 26 28  
Institutional mutual funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 26 28  
Institutional mutual funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Institutional mutual funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Cash equivalents and other short-term investments      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 318 464  
Cash equivalents and other short-term investments | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Cash equivalents and other short-term investments | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 318 464  
Cash equivalents and other short-term investments | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Certificates of deposit      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 6 19  
Certificates of deposit | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Certificates of deposit | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 6 19  
Certificates of deposit | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Private equity funds measured at net asset value      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 389 481  
Private equity funds measured at net asset value | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Private equity funds measured at net asset value | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Private equity funds measured at net asset value | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Private real estate funds measured at net asset value      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 556 435  
Private real estate funds measured at net asset value | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Private real estate funds measured at net asset value | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Private real estate funds measured at net asset value | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 34 35  
Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 21 10  
Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 13 25  
Treasury bills, U.S. Government notes and securities held as futures and other derivative collateral | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Securities lending commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 3 2  
Securities lending commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Securities lending commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 3 2  
Securities lending commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Purchased options      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 2 18  
Purchased options | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Purchased options | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 1 18  
Purchased options | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 1 0  
Foreign currency forward      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 6 8  
Derivative liabilities 4 8  
Foreign currency forward | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Derivative liabilities 0 0  
Foreign currency forward | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 6 8  
Derivative liabilities 4 8  
Foreign currency forward | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Derivative liabilities 0 0  
Futures      
Defined Benefit Plan Disclosure      
Derivative liabilities 17 11  
Futures | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Derivative liabilities 17 11  
Futures | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Derivative liabilities 0 0  
Futures | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Derivative liabilities 0 0  
Written options      
Defined Benefit Plan Disclosure      
Derivative liabilities 2 7  
Written options | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Derivative liabilities 0 0  
Written options | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Derivative liabilities 2 7  
Written options | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Derivative liabilities 0 $ 0  
Interest Rate Contract      
Defined Benefit Plan Disclosure      
Derivative liabilities 10    
Interest Rate Contract | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Derivative liabilities 0    
Interest Rate Contract | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Derivative liabilities 10    
Interest Rate Contract | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Derivative liabilities 0    
Credit default swaps      
Defined Benefit Plan Disclosure      
Derivative liabilities 1    
Credit default swaps | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Derivative liabilities 0    
Credit default swaps | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Derivative liabilities 1    
Credit default swaps | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Derivative liabilities $ 0    
Minimum      
Defined Benefit Plan Disclosure      
Number of years partnerships in private equity generally continue | Years 10    
Number of one year extensions for partnerships in private equity | Number_of_extensions 3    
Maximum      
Defined Benefit Plan Disclosure      
Number of years partnerships in private equity generally continue | Years 12    
Number of one year extensions for partnerships in private equity | Number_of_extensions 4    
[1] Excludes a $2 million payable for collateral on loaned securities in connection with TVARS’s participation in securities lending programs.
[2] Excludes approximately $130 million in net payables associated with security purchases and sales and various other payables.
[3] Excludes approximately $65 million in net payables associated with security purchases and sales and various other payables
[4] Excludes a $3 million payable for collateral on loaned securities in connection with TVARS’s participation in securities lending programs.
[5] In accordance with Accounting Standards Codification Subtopic 820-10, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy.