Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Additional Information (Detail)

v3.21.2
DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Derivative [Line Items]      
Pre-tax losses related to cash flow hedges that are currently deferred in AOCI and are expected to be reclassified to income within twelve months   $ 62,000,000  
Maximum term over hedging exposures to the variability of cash flow   11 years  
Collateral Securities Repledged, Delivered, or Used $ 15,000,000 $ 15,000,000 $ 158,000,000
Commodity Asset $ 0 0 0
Derivative Instrument Recognition Period 9 years    
Derivative net liability position     0
Derivative, Collateral, Obligation to Return Cash $ 139,000,000 139,000,000 146,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1)      
Derivative [Line Items]      
Derivatives classified as Level 1 or Level 3 0 0 0
Significant Other Observable Inputs (Level 2)      
Derivative [Line Items]      
Liability Derivatives 66,000,000 66,000,000 192,000,000
Derivative Asset, Fair Value, Gross Asset 214,000,000 214,000,000 126,000,000
Significant Unobservable Inputs (Level 3)      
Derivative [Line Items]      
Derivatives classified as Level 1 or Level 3 0 0 $ 0
Long-term debt and finance leases | Not Designated as Hedging Instrument | Fair Value      
Derivative [Line Items]      
Liability Derivatives $ 6,000,000 $ 6,000,000