Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Fair Value Measurement of Plan Assets Using Unobservable Inputs (Detail)

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COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Fair Value Measurement of Plan Assets Using Unobservable Inputs (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year $ 55  
Actual Return on Assets:    
Fair value of plan assets at end of year 0 $ 55
Fair Value, Inputs, Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 7,870  
Actual Return on Assets:    
Fair value of plan assets at end of year 11,043 7,870
Fair Value, Inputs, Level 3 | Corporate Bonds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 6 8
Actual Return on Assets:    
Assets Held at End of Year 0 (1)
Assets Sold During the Year 0 0
Purchases 0 3
Sales (6) (4)
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year 0 6
Fair Value, Inputs, Level 3 | Hedge Funds    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 49 53
Actual Return on Assets:    
Assets Held at End of Year 0 (4)
Assets Sold During the Year (49) 0
Purchases 0 0
Sales 0 0
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year 0 49
Fair Value, Inputs, Level 3 | Structured Products    
Defined Benefit Plan Disclosure [Line Items]    
Fair value of plan assets at beginning of year 55 61
Actual Return on Assets:    
Assets Held at End of Year 0 (5)
Assets Sold During the Year (49) 0
Purchases 0 3
Sales (6) (4)
Transfers Into (Out of) Level 3 0 0
Fair value of plan assets at end of year $ 0 $ 55