Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Net income for basic EPS	$ 192	$ 118	$ 222	$ 44
Convertible note interest, net of tax	0	1	1	1
Net income for diluted EPS	$ 192	$ 119	$ 223	$ 45
Basic weighted average shares outstanding	103.9	108.3	105.2	108.1
Options, warrants and non-vested stock	2.0	3.3	2.0	3.3
Convertible debt	4.0	4.6	4.0	5.5
Diluted weighted average shares outstanding	109.9	116.2	111.2	116.9
Basic (US$ per share)	$ 1.84	$ 1.09	$ 2.11	$ 0.41
Diluted (US$ per share)	$ 1.74	$ 1.02	$ 2.00	$ 0.39