Pension and Other Benefit Plans - Changes in Projected Benefit Obligation, Plan Assets and Funded Status of Plans (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Amounts Recognized in Balance Sheet
Postretirement Benefits	$ (670)	$ (2,169)
US Plan Assets
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	3,558	3,073
Service cost	80	68	59
Interest cost	150	152	150
Contributions by plan participants
Actuarial (gains) losses	(232)	399
Currency effect
Benefits paid	(138)	(134)
Projected benefit obligation at end of year	3,418	3,558	3,073
Change in Plan Assets
Plan assets at fair value at beginning of year	2,910	2,655
Actual return on plan assets	356	336
Currency effect
Company contributions	141	53
Contributions by plan participants
Benefits paid	(138)	(134)
Plan assets at fair value at end of year	3,269	2,910	2,655
(Unfunded Liability) / Asset	(149)	(648)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(149)	(648)
Total of post retirement benefits	(149)	(648)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial (gains) losses	687	1,197
Prior service cost	78	90
Total amount recognized in accumulated other comprehensive income	765	1,287
Accumulated benefit obligation	3,158	3,262
International
Change in Projected Benefit Obligations
Projected benefit obligation at beginning of year	5,798	4,666
Service cost	127	86	64
Interest cost	253	241	226
Contributions by plan participants	104	97
Actuarial (gains) losses	(168)	786
Currency effect	30	62
Benefits paid	(163)	(140)
Projected benefit obligation at end of year	5,981	5,798	4,666
Change in Plan Assets
Plan assets at fair value at beginning of year	5,120	4,097
Actual return on plan assets	836	490
Currency effect	35	62
Company contributions	314	514
Contributions by plan participants	104	97
Benefits paid	(163)	(140)
Plan assets at fair value at end of year	6,246	5,120	4,097
(Unfunded Liability) / Asset	265	(678)
Amounts Recognized in Balance Sheet
Postretirement Benefits	(5)	(687)
Other Assets	270	9
Total of post retirement benefits	265	(678)
Amounts Recognized in Accumulated Other Comprehensive Loss
Actuarial (gains) losses	882	1,234
Prior service cost	418	598
Total amount recognized in accumulated other comprehensive income	1,300	1,832
Accumulated benefit obligation	$ 5,593	$ 5,401