Quarterly report pursuant to Section 13 or 15(d)

DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Additional Information (Detail)

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DERIVATIVE INSTRUMENTS AND RISK MANAGEMENT - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 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 $ 67,000,000  
Maximum term over hedging exposures to the variability of cash flow 12 years  
Collateral Securities Repledged, Delivered, or Used $ 49,000,000 $ 158,000,000
Commodity Asset $ 0 0
Derivative Instrument Recognition Period 10 years  
Derivative net liability position   0
Derivative, Collateral, Obligation to Return Cash $ 122,000,000 146,000,000
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Derivative [Line Items]    
Derivatives classified as Level 1 or Level 3 0 0
Significant Other Observable Inputs (Level 2)    
Derivative [Line Items]    
Liability Derivatives 110,000,000 192,000,000
Derivative Asset, Fair Value, Gross Asset 185,000,000 126,000,000
Significant Unobservable Inputs (Level 3)    
Derivative [Line Items]    
Derivatives classified as Level 1 or Level 3 0 $ 0
Long-term debt and finance leases | Not Designated as Hedging Instrument | Fair Value    
Derivative [Line Items]    
Liability Derivatives $ 6,000,000