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, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 238	$ 206
Portion of overseas equities	100.00%	100.00%
U.K. Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Period for the portion of UK Equities, overseas equities, government bonds and corporate bonds, benchmarked against FTSE	5 years
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 61	$ 82
Portion of overseas equities	26.00%	40.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 171	$ 122
Portion of overseas equities	72.00%	59.00%
Quoted Price in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 238	$ 206
Quoted Price in Active Markets (Level 1) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	61	82
Quoted Price in Active Markets (Level 1) | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	171	122
Significant Other Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Other Inputs (Level 2) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Other Inputs (Level 2) | Debt securities
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
Unobservable Inputs (Level 3) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Unobservable Inputs (Level 3) | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	0
U.K. quoted equities | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 28
Portion of overseas equities	0.00%	14.00%
U.K. quoted equities | Quoted Price in Active Markets (Level 1) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		$ 28
U.K. quoted equities | Significant Other Inputs (Level 2) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
U.K. quoted equities | Unobservable Inputs (Level 3) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets		0
Overseas quoted equities
Defined Benefit Plan Disclosure [Line Items]
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 | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 61	$ 54
Portion of overseas equities	26.00%	26.00%
Overseas quoted equities | Quoted Price in Active Markets (Level 1) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 61	$ 54
Overseas quoted equities | Significant Other Inputs (Level 2) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Overseas quoted equities | Unobservable Inputs (Level 3) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.K. Government bonds | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 138	$ 97
Portion of overseas equities	58.00%	47.00%
U.K. Government bonds | Quoted Price in Active Markets (Level 1) | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 138	$ 97
U.K. Government bonds | Significant Other Inputs (Level 2) | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.K. Government bonds | Unobservable Inputs (Level 3) | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.K. corporate bonds | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 33	$ 25
Portion of overseas equities	14.00%	12.00%
U.K. corporate bonds | Quoted Price in Active Markets (Level 1) | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 33	$ 25
U.K. corporate bonds | Significant Other Inputs (Level 2) | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
U.K. corporate bonds | Unobservable Inputs (Level 3) | Debt securities
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	$ 6	$ 2
Portion of overseas equities	2.00%	1.00%
Cash | Quoted Price in Active Markets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 6	$ 2
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
MSCI World Index | Passive Global Equities
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	20.00%
MSCI World Index | Passive Global Equities Hedged
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	25.00%
MSCI World Index | Emerging Markets
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	10.00%
FTSE RAFI Developed 1000 Index | Fundamental Indexation Global Equities
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	20.00%
FTSE RAFI Developed 1000 Index | Fundamental Indexation Global Equities Hedged
Defined Benefit Plan Disclosure [Line Items]
Portion of overseas equities	25.00%
Index - Linked Index | U.K. Government Bonds
Defined Benefit Plan Disclosure [Line Items]
Portion of debt securities government bonds and corporate bonds benchmarked against FTSE	47.00%
Sterling Nominal LDI Bonds | Nominal LDI Bonds
Defined Benefit Plan Disclosure [Line Items]
Benchmarked against ILIM Custom Benchmark index	38.00%
Sterling Inflation Linked LDI Bonds | Inflation Linked LDI Bonds
Defined Benefit Plan Disclosure [Line Items]
Benchmarked against ILIM Custom Benchmark index	15.00%