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Fair Value Measurements - Fair Value Measurements (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Sep. 30, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value $ 52 $ 1
Investments    
Government debt securities 347 332
Corporate debt securities 300 282
Mortgage and asset-backed securities 36 52
Institutional mutual funds 288 242
Forward debt securities contracts - asset 11 4
Cash, Cash Equivalents, and Short-term Investments 270 179
Private equity funds measured at net asset value 583 487
Private real estate measured at net asset value 387 369
Private credit measured at net asset value 158 103
Commingled funds measured at net asset value 1,135 1,087
Total investments 4,123 3,671
Interest Rate Derivative Assets, at Fair Value 4  
Commodity contract derivatives 33 152
Total 4,160 3,946
Liabilities    
Currency swaps 141 240 [1]
Interest rate swaps 662 905
Commodity contract derivatives 2 7
Total 991 1,160
Equity Securities, FV-NI, Noncurrent 608 534
Derivative Liability, Subject to Master Netting Arrangement, after Offset 991 1,160
Derivative Asset, Subject to Master Netting Arrangement, after Offset 37 275
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash, Cash Equivalents, and Short-term Investments 270 179
Government debt securities reclassed   1
Corporate debt securities reclassed   1
Commingled funds reclassed   116
Commodity Contract under FHP    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair value (186) 115
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 186 8
Derivative Asset, Subject to Master Netting Arrangement, after Offset 0 123
Fair Value, Inputs, Level 1    
Investments    
Government debt securities 287 297
Corporate debt securities 0 0
Mortgage and asset-backed securities 0 0
Institutional mutual funds 288 242
Forward debt securities contracts - asset 0 0
Cash, Cash Equivalents, and Short-term Investments 104 61
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 1,287 1,134
Interest Rate Derivative Assets, at Fair Value 0  
Commodity contract derivatives 0 0
Total 1,287 1,134
Liabilities    
Currency swaps 0 0
Interest rate swaps 0 0
Commodity contract derivatives 0 0
Total 0 0
Equity Securities, FV-NI, Noncurrent 608 534
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash, Cash Equivalents, and Short-term Investments 104 61
Fair Value, Inputs, Level 1 | Commodity Contract under FHP    
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 0 0
Derivative Asset, Subject to Master Netting Arrangement, after Offset   0
Fair Value, Inputs, Level 2    
Investments    
Government debt securities 60 35
Corporate debt securities 300 282
Mortgage and asset-backed securities 36 52
Institutional mutual funds 0 0
Forward debt securities contracts - asset 11 4
Cash, Cash Equivalents, and Short-term Investments 166 118
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 573 491
Interest Rate Derivative Assets, at Fair Value 4  
Commodity contract derivatives 33 152
Total 610 766
Liabilities    
Currency swaps 141 240
Interest rate swaps 662 905
Commodity contract derivatives 2 7
Total 991 1,160
Equity Securities, FV-NI, Noncurrent 0 0
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Cash, Cash Equivalents, and Short-term Investments 166 118
Fair Value, Inputs, Level 2 | Commodity Contract under FHP    
Liabilities    
Derivative Liability, Subject to Master Netting Arrangement, after Offset 186 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
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  
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
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.