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Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Sep. 30, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value $ 64 $ 52
Investments    
Government debt securities 457 347
Corporate debt securities 378 300
Mortgage and asset-backed securities 43 36
Institutional mutual funds 342 288
Forward debt securities contracts - asset 11 11
Cash, Cash Equivalents, and Short-term Investments 278 270
Private equity funds measured at net asset value 738 583
Private real estate measured at net asset value 432 387
Private credit measured at net asset value 219 158
Commingled funds measured at net asset value 1,300 1,135
Total investments 4,968 4,123
Interest Rate Derivative Assets, at Fair Value 0 4
Commodity contract derivatives 7 33
Total 4,975 4,160
Liabilities    
Currency swaps 116 141 [1]
Interest rate swaps 840 662
Commodity contract derivatives 5 2
Total 1,122 991
Equity Securities, FV-NI, Noncurrent 770 608
Derivative Liability, Subject to Master Netting Arrangement, after Offset 1,122 991
Derivative Asset, Subject to Master Netting Arrangement, after Offset 7 37
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash, Cash Equivalents, and Short-term Investments 278 270
Government debt securities reclassed   104
Commodity Contract under FHP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value (161) (186)
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 161 186
Derivative Asset, Subject to Master Netting Arrangement, after Offset 0 0
Fair Value, Inputs, Level 1    
Investments    
Government debt securities 400 287
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 342 288
Forward debt securities contracts - asset 0 0
Cash, Cash Equivalents, and Short-term Investments 95 104
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 1,607 1,287
Interest Rate Derivative Assets, at Fair Value 0 0
Commodity contract derivatives 0 0
Total 1,607 1,287
Liabilities    
Currency swaps 0 0
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Total 0 0
Equity Securities, FV-NI, Noncurrent 770 608
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash, Cash Equivalents, and Short-term Investments 95 104
Fair Value, Inputs, Level 1 | Commodity Contract under FHP    
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 0 0
Fair Value, Inputs, Level 2    
Investments    
Government debt securities 57 60
Corporate debt securities 378 300
Mortgage and asset-backed securities 43 36
Institutional mutual funds 0 0
Forward debt securities contracts - asset 11 11
Cash, Cash Equivalents, and Short-term Investments 183 166
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 672 573
Interest Rate Derivative Assets, at Fair Value 0 4
Commodity contract derivatives 7 33
Total 679 610
Liabilities    
Currency swaps 116 141
Interest rate swaps 840 662
Commodity contract derivatives 5 2
Total 1,122 991
Equity Securities, FV-NI, Noncurrent 0 0
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash, Cash Equivalents, and Short-term Investments 183 166
Fair Value, Inputs, Level 2 | Commodity Contract under FHP    
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 161 186
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
Cash, Cash Equivalents, and Short-term Investments 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
Interest Rate Derivative Assets, at Fair Value 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 Measurement Inputs and Valuation Techniques [Line Items]    
Cash, Cash Equivalents, and Short-term Investments 0 0
Fair Value, Inputs, Level 3 | Commodity Contract under FHP    
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset $ 0 $ 0
[1] See Note 15 — Risk Management Activities and Derivative Transactions — Offsetting of Derivative Assets and Liabilities.