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Fair Value Measurements Fair Value Measurements (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Financing Receivable, Net $ 136 $ 123
Investments    
Equity securities 258 220
Government debt securities 269 236
Corporate debt securities 504 499
Mortgage and asset-backed securities 34 50
Institutional mutual funds 224 126
Forward debt securities contracts 59 45
Private credit measured at net asset value 19  
Private equity funds measured at net asset value(1) 140 132 [1]
Private real estate funds measured at net asset value(1) 128 124 [1]
Commingled funds measured at net asset value(1) 1,200 1,430 [1]
Total investments 2,835 2,862
Commodity contract derivatives 42 72
Total 2,877 2,934
Liabilities    
Currency swaps [2] 123 94
Interest rate swaps 1,408 1,199
Commodity contract derivatives (14) (12)
Total 1,545 1,305
Fair Value, Inputs, Level 1    
Investments    
Equity securities 258 220
Government debt securities 219 199
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 224 126
Forward debt securities contracts 0 0
Private credit measured at net asset value 0  
Private equity funds measured at net asset value(1) 0 0 [1]
Private real estate funds measured at net asset value(1) 0 0 [1]
Commingled funds measured at net asset value(1) 0 0 [1]
Total investments 701 545
Commodity contract derivatives 0 0
Total 701 545
Liabilities    
Currency swaps 0 0 [2]
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Total 0 0
Fair Value, Inputs, Level 2    
Investments    
Equity securities 0 0
Government debt securities 50 37
Corporate debt securities 504 499
Mortgage and asset-backed securities 34 50
Institutional mutual funds 0 0
Forward debt securities contracts 59 45
Private credit measured at net asset value 0  
Private equity funds measured at net asset value(1) 0 0 [1]
Private real estate funds measured at net asset value(1) 0 0 [1]
Commingled funds measured at net asset value(1) 0 0 [1]
Total investments 647 631
Commodity contract derivatives 2 13
Total 649 644
Liabilities    
Currency swaps 123 94 [2]
Interest rate swaps 1,408 1,199
Commodity contract derivatives (12) (11)
Total 1,543 1,304
Fair Value, Inputs, Level 3    
Investments    
Equity securities 0 0
Government debt securities 0 0
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 0 0
Forward debt securities contracts 0 0
Private credit measured at net asset value 0  
Private equity funds measured at net asset value(1) 0 0 [1]
Private real estate funds measured at net asset value(1) 0 0 [1]
Commingled funds measured at net asset value(1) 0 0 [1]
Total investments 0 0
Commodity contract derivatives 40 59
Total 40 59
Liabilities    
Currency swaps 0 0 [2]
Interest rate swaps 0 0
Commodity contract derivatives 2 (1)
Total $ 2 $ 1
[1] Certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been categorized in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the Consolidated Balance Sheets.
[2] TVA records currency swaps net of cash collateral received from or paid to the counterparty, to the extent such amount is not recorded in Accounts payable and accrued liabilities. See Note 14 — Offsetting of Derivative Assets and Liabilities.