Annual report pursuant to Section 13 and 15(d)

COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Detail)

v3.10.0.1
COMPANY-SPONSORED EMPLOYEE BENEFIT PLANS - Reconciliation of the Changes in the Plans' Benefit Obligations and Fair Value of Plan Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Benefit Obligations:    
Actuarial (gain)/loss $ (3,174) $ 4,441
Fair Value of Plan Assets:    
Fair value of plan assets at beginning of year 43,448  
Fair value of plan assets at end of year $ 40,864 $ 43,448