RETIREMENT AND DEFERRED COMPENSATION PLANS - Fair Values of Plan Assets for Each Major Asset Category Based on Nature and Significant Concentration of Risks in Plan Assets (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 208	$ 238
Period for the portion of UK Equities, overseas equities, government bonds and corporate bonds, benchmarked against FTSE	5 years
Quoted Price in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 208	238
Significant Other Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46	61
Equity securities | Quoted Price in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	46	61
Equity securities | Significant Other Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Equity securities | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Overseas quoted equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 46	61
Performance target over the benchmark	2.00%
Period for the portion of UK Equities, overseas equities, government bonds and corporate bonds, benchmarked against FTSE	3 years
Overseas quoted equities | Quoted Price in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 46	61
Overseas quoted equities | Significant Other Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Overseas quoted equities | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Passive Global Equities
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	20.00%
Passive Global Equities Hedged
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	25.00%
Fundamental Indexation Global Equities
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	20.00%
Fundamental Indexation Global Equities Hedged
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	25.00%
Emerging Markets
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	10.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 161	171
Debt securities | Quoted Price in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	161	171
Debt securities | Significant Other Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Debt securities | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.K. Government bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	129	138
U.K. Government bonds | Quoted Price in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	129	138
U.K. Government bonds | Significant Other Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.K. Government bonds | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
Index - Linked Index
Defined Benefit Plan Disclosure [Line Items]
Portion of debt securities government bonds and corporate bonds benchmarked against FTSE	61.00%
Sterling Nominal LDI Bonds
Defined Benefit Plan Disclosure [Line Items]
Benchmarked against ILIM Custom Benchmark index	8.00%
Sterling Inflation Linked LDI Bonds
Defined Benefit Plan Disclosure [Line Items]
Benchmarked against ILIM Custom Benchmark index	31.00%
U.K. corporate bonds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 32	33
U.K. corporate bonds | Quoted Price in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	32	33
U.K. corporate bonds | Significant Other Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.K. corporate bonds | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	6
Cash | Quoted Price in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	6
Cash | Significant Other Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Cash | Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0