Financial Instruments and Fair Value Measurements - Foreign Currency Contracts Activity (Detail)		3 Months Ended
		Mar. 31, 2017 USD ($) Derivative CAD / $ £ / $ € / $ ¥ / $		Mar. 31, 2017 GBP (£) Derivative CAD / $ £ / $ € / $ ¥ / $	Mar. 31, 2017 JPY (¥) Derivative CAD / $ £ / $ € / $ ¥ / $	Mar. 31, 2017 CAD Derivative CAD / $ £ / $ € / $ ¥ / $	Mar. 31, 2017 EUR (€) Derivative CAD / $ £ / $ € / $ ¥ / $	Mar. 31, 2016 USD ($)		Mar. 31, 2016 GBP (£)	Mar. 31, 2016 JPY (¥)	Mar. 31, 2016 CAD	Mar. 31, 2016 EUR (€)
CAD
Derivative [Line Items]
Notional amounts at January 1		$ 38,000,000				CAD 50,000,000
New contracts		0				0
Matured, expired or settled contracts		(6,000,000)				(7,000,000)
Notional amounts at March 31		$ 32,000,000				CAD 43,000,000
Weighted average forward rate at March 31 | CAD / $		1.32		1.32	1.32	1.32	1.32
Active contracts at March 31		14		14	14	14	14
Net Investment Hedges [Member] | CAD
Derivative [Line Items]
Notional amounts at January 1		$ 100,000,000				CAD 133,000,000		$ 0				CAD 0
New contracts		99,000,000				133,000,000		100,000,000				133,000,000
Matured, expired or settled contracts		(100,000,000)				(133,000,000)		0				0
Notional amounts at March 31		$ 99,000,000				CAD 133,000,000		100,000,000				CAD 133,000,000
Weighted average forward rate at March 31 | CAD / $		1.33		1.33	1.33	1.33	1.33
Active contracts at March 31		2		2	2	2	2
Net Investment Hedges [Member] | GBP [Member]
Derivative [Line Items]
Notional amounts at January 1		$ 46,000,000		£ 31,000,000				386,000,000		£ 238,000,000
New contracts		127,000,000		100,000,000				0		0
Matured, expired or settled contracts		0		0				0		0
Notional amounts at March 31		$ 173,000,000		£ 131,000,000				386,000,000		238,000,000
Weighted average forward rate at March 31 | £ / $		1.32		1.32	1.32	1.32	1.32
Active contracts at March 31		4		4	4	4	4
Net Investment Hedges [Member] | JPY
Derivative [Line Items]
Notional amounts at January 1								0			¥ 0
New contracts								99,000,000			11,189,000,000
Matured, expired or settled contracts								(99,000,000)			(11,189,000,000)
Notional amounts at March 31								0			0
Foreign Currency Contracts [Member] | GBP [Member]
Derivative [Line Items]
Notional amounts at January 1		$ 78,000,000	[1]	£ 48,000,000				148,000,000	[1]	97,000,000
New contracts		80,000,000	[1]	63,000,000				0	[1]	0
Matured, expired or settled contracts		(22,000,000)	[1]	(15,000,000)				(18,000,000)	[1]	(12,000,000)
Notional amounts at March 31		$ 136,000,000	[1]	£ 96,000,000				130,000,000	[1]	£ 85,000,000
Weighted average forward rate at March 31 | £ / $		1.37		1.37	1.37	1.37	1.37
Active contracts at March 31		17		17	17	17	17
Foreign Currency Contracts [Member] | JPY
Derivative [Line Items]
Notional amounts at January 1		$ 144,000,000	[1]		¥ 15,500,000,000			109,000,000	[1]		12,840,000,000
New contracts		19,000,000	[1]		2,000,000,000			36,000,000	[1]		4,000,000,000
Matured, expired or settled contracts		(16,000,000)	[1]		(1,750,000,000)			(13,000,000)	[1]		(1,460,000,000)
Notional amounts at March 31		$ 147,000,000	[1]		¥ 15,750,000,000			132,000,000	[1]		¥ 15,380,000,000
Weighted average forward rate at March 31 | ¥ / $		107.19		107.19	107.19	107.19	107.19
Active contracts at March 31		31		31	31	31	31
Foreign Currency Contracts [Member] | EUR
Derivative [Line Items]
Notional amounts at January 1		$ 197,000,000	[1]				€ 174,000,000	310,000,000	[1]				€ 275,000,000
New contracts		36,000,000	[1]				32,000,000	68,000,000	[1]				60,000,000
Matured, expired or settled contracts		(30,000,000)	[1]				(26,000,000)	(51,000,000)	[1]				(45,000,000)
Notional amounts at March 31		$ 203,000,000	[1]				€ 180,000,000	327,000,000	[1]				€ 290,000,000
Weighted average forward rate at March 31 | € / $		1.13		1.13	1.13	1.13	1.13
Active contracts at March 31		25		25	25	25	25
Foreign Currency Contracts [Member] | USD [Member]
Derivative [Line Items]
Notional amounts at January 1 | $	[1]							50,000,000
New contracts | $	[1]							9,000,000
Matured, expired or settled contracts | $	[1]							(8,000,000)
Notional amounts at March 31 | $	[1]							$ 51,000,000

[1] During the three months ended March 31, 2017, and 2016, we exercised 11 and 8 option contracts and realized gains of $5.3 million and $1.7 million, respectively, in Foreign Currency and Derivative Losses, Net.