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Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Sep. 30, 2019
Investments    
Equity securities $ 500 $ 464
Government debt securities 525 344
Corporate debt securities 356 417
Mortgage and asset-backed securities 27 32
Institutional mutual funds 188 250
Forward debt securities contracts - asset 13 22
Private equity funds measured at net asset value 194 140
Private real estate measured at net asset value 168 135
Private credit measured at net asset value 53 33
Commingled funds measured at net asset value 1,174 1,131
Total investments 3,198 2,968
Commodity contract derivatives 49 12
Total 3,247 2,980
Liabilities    
Currency swaps 209 208 [1]
Interest rate swaps 2,041 1,764
Commodity contract derivatives 3 53
Total 2,253 2,025
Fair Value, Inputs, Level 1    
Investments    
Equity securities 500 464
Government debt securities 485 279
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 188 250
Forward debt securities contracts - asset 0 0
Private equity funds measured at net asset value 0 0 [2]
Private real estate measured at net asset value 0 0 [2]
Private credit measured at net asset value 0 0
Commingled funds measured at net asset value 0 0 [2]
Total investments 1,173 993
Commodity contract derivatives 0 0
Total 1,173 993
Liabilities    
Currency swaps 0 0 [1]
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 40 65
Corporate debt securities 356 417
Mortgage and asset-backed securities 27 32
Institutional mutual funds 0 0
Forward debt securities contracts - asset 13 22
Private equity funds measured at net asset value 0 0 [2]
Private real estate measured at net asset value 0 0 [2]
Private credit measured at net asset value 0 0
Commingled funds measured at net asset value 0 0 [2]
Total investments 436 536
Commodity contract derivatives 49 7
Total 485 543
Liabilities    
Currency swaps 209 208 [1]
Interest rate swaps 2,041 1,764
Commodity contract derivatives 3 44
Total 2,253 2,016
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 - asset 0 0
Private equity funds measured at net asset value 0 0 [2]
Private real estate measured at net asset value 0 0 [2]
Private credit measured at net asset value 0 0
Commingled funds measured at net asset value 0 0 [2]
Total investments 0 0
Commodity contract derivatives 0 5
Total 0 5
Liabilities    
Currency swaps 0 0 [1]
Interest rate swaps 0 0
Commodity contract derivatives 0 9
Total $ 0 $ 9
[1] See Note 15 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.
[2] 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 on the Consolidated Balance Sheets.