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Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Sep. 30, 2021
Investments    
Government debt securities $ 394 $ 597
Corporate debt securities 283 411
Mortgage and asset-backed securities 52 63
Institutional mutual funds 242 225
Forward debt securities contracts - asset 4 2
Private equity funds measured at net asset value 487 357
Private real estate measured at net asset value 369 272
Private credit measured at net asset value 103 71
Commingled funds measured at net asset value 1,203 1,421
Total investments 3,671 4,053
Commodity contract derivatives 152 250
Total 3,946 4,303
Liabilities    
Currency swaps 240 83 [1]
Interest rate swaps 905 1,639
Commodity contract derivatives 7 3
Total 1,160 1,725
Equity Securities, FV-NI, Noncurrent 534 634
Derivative Liability, Subject to Master Netting Arrangement, after Offset 1,160 1,725
Derivative Asset, Subject to Master Netting Arrangement, after Offset 275 250
Commodity Contract under FHP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value 115 0
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 8 0
Derivative Asset, Subject to Master Netting Arrangement, after Offset 123 0
Fair Value, Inputs, Level 1    
Investments    
Government debt securities 358 573
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 242 225
Forward debt securities contracts - asset 0 0
Private equity funds measured at net asset value 0 0
Private real estate measured at net asset value 0 0
Private credit measured at net asset value 0 0
Commingled funds measured at net asset value 0 0
Total investments 1,134 1,432
Commodity contract derivatives 0 0
Total 1,134 1,432
Liabilities    
Currency swaps 0 0
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Total 0 0
Equity Securities, FV-NI, Noncurrent 534 634
Fair Value, Inputs, Level 1 | Commodity Contract under FHP    
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 0  
Derivative Asset, Subject to Master Netting Arrangement, after Offset 0  
Fair Value, Inputs, Level 2    
Investments    
Government debt securities 36 24
Corporate debt securities 283 411
Mortgage and asset-backed securities 52 63
Institutional mutual funds 0 0
Forward debt securities contracts - asset 4 2
Private equity funds measured at net asset value 0 0
Private real estate measured at net asset value 0 0
Private credit measured at net asset value 0 0
Commingled funds measured at net asset value 0 0
Total investments 375 500
Commodity contract derivatives 152 250
Total 650 750
Liabilities    
Currency swaps 240 83
Interest rate swaps 905 1,639
Commodity contract derivatives 7 3
Total 1,160 1,725
Equity Securities, FV-NI, Noncurrent 0 0
Fair Value, Inputs, Level 2 | Commodity Contract under FHP    
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 8  
Derivative Asset, Subject to Master Netting Arrangement, after Offset 123  
Fair Value, Inputs, Level 3    
Investments    
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
Private real estate measured at net asset value 0 0
Private credit measured at net asset value 0 0
Commingled funds measured at net asset value 0 0
Total investments 0 0
Commodity contract derivatives 0 0
Total 0 0
Liabilities    
Currency swaps 0 0
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Total 0 0
Equity Securities, FV-NI, Noncurrent 0 $ 0
Fair Value, Inputs, Level 3 | Commodity Contract under FHP    
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 0  
Derivative Asset, Subject to Master Netting Arrangement, after Offset $ 0  
[1] See Note 15 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.