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 ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Derivative [Line Items]    
Collateral received under contractual provisions $ 383 $ 325
Derivative net liability position   0
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 $ 132  
Maximum term over hedging exposures to the variability of cash flow 14 years  
Change in Credit Rating    
Derivative [Line Items]    
Derivative, Additional Collateral, Obligation to Return Cash $ 1 0
Long-term debt and finance leases | Designated as Hedging Instrument | Fair Value    
Derivative [Line Items]    
Liability Derivatives $ 27 $ 16