Changes in Component of Accumulated Other Comprehensive Income (Loss) of Parent (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (650)
Other comprehensive income (loss):
Other comprehensive income (loss)	(143)	(156)	13
Ending Balance	(793)	(650)
Parent Company
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(650)	(496)	(504)
Other comprehensive income (loss):
Currency translation adjustments	(6)	(91)	10
Reclassification of amount to net income, related to foreign currency translation		(1)	10
Holding gains (losses)	10	(17)	2
Reclassification of amount to net income, related to hedging	7
Plan amendments	(6)
Net actuarial losses	(174)	(72)	(30)
Amortization of net actuarial losses included in net periodic benefit cost	14	20	19
Settlement loss		5	2
Tax (expense) benefit	12	2	(5)
Other comprehensive income (loss)	(143)	(154)	8
Ending Balance	(793)	(650)	(496)
Parent Company | Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(192)	(100)	(115)
Other comprehensive income (loss):
Currency translation adjustments	(6)	(91)	10
Reclassification of amount to net income, related to foreign currency translation		(1)	10
Tax (expense) benefit			(5)
Other comprehensive income (loss)	(6)	(92)	15
Ending Balance	(198)	(192)	(100)
Parent Company | Hedging
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(10)
Other comprehensive income (loss):
Holding gains (losses)	9	(13)
Reclassification of amount to net income, related to hedging	7
Tax (expense) benefit	(3)	3
Other comprehensive income (loss)	13	(10)
Ending Balance	3	(10)
Parent Company | Investments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	10	14	12
Other comprehensive income (loss):
Holding gains (losses)	1	(4)	2
Tax (expense) benefit	1
Other comprehensive income (loss)	2	(4)	2
Ending Balance	12	10	14
Parent Company | Defined Benefit Plan
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(458)	(410)	(401)
Other comprehensive income (loss):
Plan amendments	(6)
Net actuarial losses	(174)	(72)	(30)
Amortization of net actuarial losses included in net periodic benefit cost	14	20	19
Settlement loss		5	2
Tax (expense) benefit	14	(1)
Other comprehensive income (loss)	(152)	(48)	(9)
Ending Balance	$ (610)	$ (458)	$ (410)