Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Income Taxes [Line Items]
Provision for income taxes, net	$ 179	[1]	$ (12)	[1]	$ 13	[1]	$ (18)	[1]	$ 194	[1]	$ 83	[1]	$ 109	[1]	$ 43	[1]	$ 161		$ 428		$ 291
Cash taxes paid, net of refunds																	169		112		33
Federal statutory rate																	35.00%		35.00%		35.00%
Tax credit carryforwards for income tax purposes	334																334
Tax credit carryforwards for income tax purposes, beginning expiration year																	2020
Tax contingencies	407	[2]							294	[2]							407	[2]	294	[2]	229	[2]	213
Tax contingencies that would decrease effective tax rate	346																346
Accrrued interest and penalties, net of federal income tax benefit, related to tax contingencies	33								25								33		25
Interest and penalties, net of federal income tax benefit																	8		1		3
Description of the status of the tax examination																	We are under examination, or may be subject to examination, by the Internal Revenue Service (“IRS”) for the calendar year 2005 or thereafter.
Additional federal tax period beginning in 2005																	7 years
Tax examination, additional tax expense including interest and penalties																	1,500
Internal Revenue Service (IRS)
Income Taxes [Line Items]
Net operating loss carryforwards	275																275
Operating loss carryforwards, beginning expiration year																	2027
Foreign Country
Income Taxes [Line Items]
Net operating loss carryforwards	1,600																1,600
Operating loss carryforwards, beginning expiration year																	2014
State of Arizona
Income Taxes [Line Items]
Net operating loss carryforwards	880																880
Operating loss carryforwards, beginning expiration year																	2014
France
Income Taxes [Line Items]
Tax examination, additional tax expense including interest and penalties																	$ 250

[1] The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and changes in the number of weighted-average shares outstanding for each period.

[2] As of December 31, 2013, we had $407 million of tax contingencies, of which $346 million, if fully recognized, would decrease our effective tax rate.