Long Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Other debt	$ 476	$ 478
Total long-term debt	7,034	7,200
Less: unamortized discounts	(882)	(892)
Total long-term debt, net of unamortized discounts	6,152	6,308
Less: current maturities of long-term debt		(150)
Total long-term debt, net	6,152	6,158
2.13% to 6.15%, due 2016 to 2042
Debt Instrument [Line Items]
Notes	5,642	5,642
7.00% To 7.75%, Due 2016 To 2036
Debt Instrument [Line Items]
Notes	916	930
7.38%, due 2013
Debt Instrument [Line Items]
Notes		$ 150