Schedule Of Selected Quarterly Financial Data (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Quarterly Financial Data [Line Items]
Extinguishment of corporate debt	$ 23	$ 2	$ 23	$ 27
Extinguishment of corporate debt, net of tax	16	1	21	23
Restructuring charges	12	7	12	7	5				38	5	11
Restructuring charges, net of tax	9	5	8	5	3
Acquisition charges	13	11	4	6	160
Acquisition charges, net of tax	13	10	2	5	153
Amortization of intangible assets	4	4	3	5	4				21	7	3
Amortization of intangible assets, net of tax	2	3	2	4	3
Non-cash income tax benefit for pre-Separation taxes		128
Interest expense							7	7	268	219	170
Interest expense, net of tax							4	4
General and administrative expenses								2
General and administrative expenses, net of tax								1
Due-diligence, advisory and other expenses					39	47	11
Due-diligence, advisory and other expenses, net of tax					33	31	9
Losses on foreign-currency hedges						26	23
Losses on foreign-currency hedges, net of tax						16	14
Non-cash write-off of acquisition charges					117
Non-cash write-off of acquisition charges, net of tax					$ 117