Earnings Per Share (Schedule Of Basic And Diluted Earnings Per Share) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Antidilutive stock options outstanding	3,410,173		3,803,310		3,484,609		3,815,395
Net income (loss)	$ 581		$ 137		$ 591		$ (1,138)
Basic weighted average shares	193,926,953	[1]	199,295,797	[1]	193,700,328	[1]	199,602,865	[1]
Stock options	1,014,280		768,882		1,063,289
Diluted weighted average shares	194,941,233		200,064,679		194,763,617		199,602,865
Basic	$ 2.99		$ 0.69		$ 3.05		$ (5.70)
Diluted	$ 2.98		$ 0.68		$ 3.03		$ (5.70)
Unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents	5,597,797		5,035,256		5,400,564		5,102,013

[1] Includes 5,597,797 and 5,035,256 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the three months ended June 30, 2012 and 2011, respectively. Includes 5,400,564 and 5,102,013 of unvested restricted stock and units that receive nonforfeitable dividends or dividend equivalents for the six months ended June 30, 2012 and 2011, respectively.