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Fair Value Hierarchy - Significant Unobservable Inputs Used to Value Level 3 Derivatives (Detail)
Sep. 30, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Sep. 30, 2024
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Fair Value Measurement Inputs Disclosure [Line Items]            
Fair value of derivative assets (liabilities) $ 396,000,000 $ 959,000,000 $ 825,000,000 $ 949,000,000 $ 534,000,000 $ 810,000,000
Interest rates            
Fair Value Measurement Inputs Disclosure [Line Items]            
Fair value of derivative assets (liabilities) 160,000,000 26,000,000 (112,000,000) (128,000,000) (367,000,000) (439,000,000)
Credit            
Fair Value Measurement Inputs Disclosure [Line Items]            
Fair value of derivative assets (liabilities) 1,364,000,000 1,288,000,000 1,218,000,000 1,627,000,000 1,726,000,000 1,650,000,000
Currencies            
Fair Value Measurement Inputs Disclosure [Line Items]            
Fair value of derivative assets (liabilities) 113,000,000 127,000,000 47,000,000 (69,000,000) 24,000,000 42,000,000
Commodities            
Fair Value Measurement Inputs Disclosure [Line Items]            
Fair value of derivative assets (liabilities) 753,000,000 839,000,000 778,000,000 782,000,000 648,000,000 628,000,000
Equities            
Fair Value Measurement Inputs Disclosure [Line Items]            
Fair value of derivative assets (liabilities) $ (1,994,000,000) $ (1,321,000,000) $ (1,106,000,000) $ (1,263,000,000) $ (1,497,000,000) $ (1,071,000,000)
Minimum | Interest rates | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs (0.10)   (0.10)      
Minimum | Interest rates | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.31   0.31      
Minimum | Credit | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 9   8      
Minimum | Credit | Level 3 | Upfront credit points            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0   (0.10)      
Minimum | Credit | Level 3 | Recovery rates            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.20   0.20      
Minimum | Currencies | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0   0.20      
Minimum | Currencies | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.16   0.17      
Minimum | Commodities | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.16   0.21      
Minimum | Commodities | Electricity | Level 3 | Spread            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 3.10   1.89      
Minimum | Commodities | Natural gas | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs (3.51)   (2.82)      
Minimum | Commodities | Crude Oil, Condensate, and Natural Gas Liquids (NGL) | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs (4.79)   (6.42)      
Minimum | Equities | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs (0.70)   (0.75)      
Minimum | Equities | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.02   0.02      
Maximum | Interest rates | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.95   0.95      
Maximum | Interest rates | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 1.51   1.01      
Maximum | Credit | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 1,787   1,328      
Maximum | Credit | Level 3 | Upfront credit points            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 1   1      
Maximum | Credit | Level 3 | Recovery rates            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.60   0.70      
Maximum | Currencies | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.68   0.68      
Maximum | Currencies | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.17   0.17      
Maximum | Commodities | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.92   1.20      
Maximum | Commodities | Electricity | Level 3 | Spread            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 466.76   587.75      
Maximum | Commodities | Natural gas | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 4.02   3.76      
Maximum | Commodities | Crude Oil, Condensate, and Natural Gas Liquids (NGL) | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 32.06   22.10      
Maximum | Equities | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 1   1      
Maximum | Equities | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 1.07   1.01      
Average | Interest rates | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.34   0.60      
Average | Interest rates | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.69   0.63      
Average | Credit | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 147   134      
Average | Credit | Level 3 | Upfront credit points            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.24   0.24      
Average | Credit | Level 3 | Recovery rates            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.43   0.46      
Average | Currencies | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.20   0.34      
Average | Currencies | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.16   0.17      
Average | Commodities | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.40   0.37      
Average | Commodities | Electricity | Level 3 | Spread            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 58.51   52.18      
Average | Commodities | Natural gas | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs (0.14)   (0.14)      
Average | Commodities | Crude Oil, Condensate, and Natural Gas Liquids (NGL) | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 13.51   1.77      
Average | Equities | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.58   0.56      
Average | Equities | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.14   0.15      
Median | Interest rates | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.25   0.72      
Median | Interest rates | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.56   0.59      
Median | Credit | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 100   91      
Median | Credit | Level 3 | Upfront credit points            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.14   0.14      
Median | Credit | Level 3 | Recovery rates            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.40   0.50      
Median | Currencies | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.03   0.23      
Median | Currencies | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.16   0.17      
Median | Commodities | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.34   0.33      
Median | Commodities | Electricity | Level 3 | Spread            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 37.89   32.68      
Median | Commodities | Natural gas | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs (0.15)   (0.16)      
Median | Commodities | Crude Oil, Condensate, and Natural Gas Liquids (NGL) | Level 3 | Credit spreads (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 19.49   (3.80)      
Median | Equities | Level 3 | Correlation            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.59   0.52      
Median | Equities | Level 3 | Volatility (bps)            
Fair Value Measurement Inputs Disclosure [Line Items]            
Significant unobservable inputs 0.08   0.12