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Benefit Plans Fair Value Measurements (Details)
$ in Millions
 12 Months Ended
Sep. 30, 2016
USD ($)
Years
Sep. 30, 2015
USD ($)
Sep. 30, 2014
USD ($)
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] $ 7,293 [2] $ 6,964 [3]  
Derivative liabilities 16 [2],[4] 34 [1],[3]  
Net payables 129 130  
Payables for collateral on loaned securities $ 3 3  
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 $ 2,019 2,060  
Derivative liabilities 2 17  
Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 2,359 2,119  
Derivative liabilities 14 17  
Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 97 91 $ 66
Derivative liabilities 0 0  
Equity securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] 1,847 [2] 1,650 [4]  
Equity securities | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 1,846 1,649  
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 20 [1],[2] 36  
Preferred securities | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 3 2  
Preferred securities | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 17 34  
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] 1,145 [2] 1,161 [4]  
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 1,135 1,149  
Corporate debt securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 10 12  
Residential mortgage-backed securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] 181 [2] 151 [4]  
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 165 138  
Residential mortgage-backed securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 16 13  
Debt securities issued by U.S. Treasury and other U.S. government agencies      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] 113 [2] 362 [4]  
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 113 362  
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  
Asset-backed securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] 118 [2] 156 [4]  
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 87 116  
Asset-backed securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 31 40  
Debt securities issued by state/local governments      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] 16 [2] 25 [4]  
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 16 25  
Debt securities issued by state/local governments | 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 [1] 332 [2] 294 [4]  
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 299 281  
Debt securities issued by foreign governments | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 33 13  
Commercial mortgage-backed securities      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] 44 [2] 43 [4]  
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 38 32  
Commercial mortgage-backed securities | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 6 11  
Equity security commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1],[5] 682 [2] 642 [4]  
Equity security commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Equity security commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Equity security commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Debt security commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1],[5] 653 [2] 654 [4]  
Debt security commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Debt security commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Debt security commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Commodity commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1],[5] 302 [2] 244 [4]  
Commodity commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Commodity commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Commodity commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Blended security commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1],[5] 225 [2] 206 [4]  
Blended security commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Blended security commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Blended security commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Institutional mutual funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] 10 [2] 26 [4]  
Institutional mutual funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 10 26  
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 [1] 612 [2] 318 [4]  
Cash equivalents and other short-term investments | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 41 0  
Cash equivalents and other short-term investments | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 571 318  
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 [1] 16 [2] 6 [4]  
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 16 6  
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] 385 [1],[2] 389  
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] 568 [1],[2] 556  
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 [1] 13 [2] 34 [4]  
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 4 [5] 21  
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 9 [5] 13  
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 [5] 0  
Securities lending commingled funds      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 3 [3],[4] 3 [1],[2]  
Securities lending commingled funds | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Securities lending commingled funds | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Securities lending commingled funds | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [5] 0 0  
Future      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1],[2] 2    
Derivative liabilities [1] 2 [2] 17 [4]  
Future | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 2    
Derivative liabilities 2 17  
Future | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0    
Derivative liabilities 0 0  
Future | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0    
Derivative liabilities 0 0  
Purchased options      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1],[2] 1    
Derivative liabilities [1],[2] 1    
Purchased options | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0    
Derivative liabilities 0    
Purchased options | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 1    
Derivative liabilities 1    
Purchased options | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0    
Derivative liabilities 0    
Interest Rate Swap      
Defined Benefit Plan Disclosure      
Derivative liabilities [1] 3 [2] 10 [4]  
Interest Rate Swap | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Derivative liabilities 0 0  
Interest Rate Swap | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Derivative liabilities 3 10  
Interest Rate Swap | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Derivative liabilities 0 0  
Foreign currency forward      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1] 5 [2] 6 [4]  
Derivative liabilities [1] 9 [2] 4 [4]  
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 5 6  
Derivative liabilities 9 4  
Foreign currency forward | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets 0 0  
Derivative liabilities 0 0  
Written options      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets [1],[4]   2  
Derivative liabilities [1],[4]   2  
Written options | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets   0  
Derivative liabilities   0  
Written options | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets   1  
Derivative liabilities   2  
Written options | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Fair value of gross plan assets   1  
Derivative liabilities   0  
Credit default swaps      
Defined Benefit Plan Disclosure      
Derivative liabilities [1] 1 [2] 1 [4]  
Credit default swaps | Fair Value, Inputs, Level 1      
Defined Benefit Plan Disclosure      
Derivative liabilities 0 0  
Credit default swaps | Fair Value, Inputs, Level 2      
Defined Benefit Plan Disclosure      
Derivative liabilities 1 1  
Credit default swaps | Fair Value, Inputs, Level 3      
Defined Benefit Plan Disclosure      
Derivative liabilities $ 0 $ 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 | Years 2    
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 | Years 3    
[1] Excludes a $3 million payable for collateral on loaned securities in connection with TVARS’s participation in securities lending programs.
[2] Excludes approximately $129 million in net payables associated with security purchases and sales and various other payables.
[3] Excludes approximately $130 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] 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.