Income Tax - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Income Tax Examination [Line Items]
Pretax provision relating to accounts receivable				$ (572)
Deferred tax assets, valuation allowances relating to net operating losses in certain countries	234		234		238
US federal statutory rate	35.00%	35.00%	35.00%	35.00%
Domestic Country
Income Tax Examination [Line Items]
Pretax provision relating to accounts receivable				53
Foreign Country
Income Tax Examination [Line Items]
Pretax provision relating to accounts receivable				$ 625