RETIREMENT BENEFITS - Reconciliation of Projected Benefit Obligation and Funded Status (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Change in Projected Benefit Obligation:
Settlement	$ (55)	$ 0
Settlement payments	(147)	0
Change in Plan Assets:
Plan assets at fair value at beginning of fiscal year	1,162
Settlement payments	(147)	0
Plan assets at fair value at end of fiscal year	1,173	1,162
Pension Plan
Change in Projected Benefit Obligation:
Benefit obligation at beginning of fiscal year	1,590	1,753
Service cost	4	6	$ 16
Interest cost	65	60	65
Actuarial (gain) loss	170	(136)
Benefits paid	(85)	(93)
Benefit obligation at end of fiscal year	1,542	1,590	1,753
Change in Plan Assets:
Plan assets at fair value at beginning of fiscal year	1,162	1,296
Actual net return on plan assets	201	(84)
Employer contributions	42	43	32
Benefits paid	(85)	(93)
Plan assets at fair value at end of fiscal year	1,173	1,162	$ 1,296
Funded (underfunded) status at end of period	$ (369)	$ (428)