Pension Plans, Other Postretirement Benefits, and Defined-Contribution Plans - Change in Plan Assets, Funded Status of the Plans, and Amounts Recognized in the Financial Statements (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Pension Plans, Defined Benefit [Member]
Change in plan assets
Fair value of plan assets at beginning of year	$ 1,462	$ 1,308
Actual return on plan assets	278	159
Employer contributions	160	107
Participant contributions	0	1
Benefit payments	(149)	(117)
Foreign-currency exchange-rate changes	3	4
Fair value of plan assets at end of year	1,754	1,462
Funded status of the plans at end of year	(404)	(835)
Total recognized amounts in the balance sheet consist of
Other assets	37	30
Accrued expenses	(19)	(44)
Other long-term liabilities—other	(422)	(821)
Total	(404)	(835)
Total recognized amounts in accumulated other comprehensive income consist of
Prior service cost (credit)	(1)	(2)
Net actuarial (gain) loss	441	916
Total	440	914
Other Postretirement Benefit Plans, Defined Benefit [Member]
Change in plan assets
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	14	19
Participant contributions	4	3
Benefit payments	(18)	(22)
Foreign-currency exchange-rate changes	0	0
Fair value of plan assets at end of year	0	0
Funded status of the plans at end of year	(294)	(359)
Total recognized amounts in the balance sheet consist of
Other assets	0	0
Accrued expenses	(15)	(16)
Other long-term liabilities—other	(279)	(343)
Total	(294)	(359)
Total recognized amounts in accumulated other comprehensive income consist of
Prior service cost (credit)	2	3
Net actuarial (gain) loss	(78)	(4)
Total	$ (76)	$ (1)