Products and Services Revenues (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended	9 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended		6 Months Ended	9 Months Ended	3 Months Ended
	Sep. 30, 2012	Mar. 31, 2012 item	Sep. 30, 2011	Sep. 30, 2011	Sep. 30, 2012 item	Sep. 30, 2012 Strategic services	Sep. 30, 2011 Strategic services	Sep. 30, 2011 Strategic services	Sep. 30, 2012 Strategic services	Sep. 30, 2012 Legacy services	Sep. 30, 2011 Legacy services	Sep. 30, 2011 Legacy services	Sep. 30, 2012 Legacy services	Sep. 30, 2012 Data integration	Sep. 30, 2011 Data integration	Sep. 30, 2011 Data integration	Sep. 30, 2012 Data integration	Sep. 30, 2012 Affiliates and other services	Sep. 30, 2011 Affiliates and other services	Sep. 30, 2011 Affiliates and other services	Sep. 30, 2012 Affiliates and other services	Mar. 31, 2011 Predecessor	Mar. 31, 2011 Predecessor Strategic services	Mar. 31, 2011 Predecessor Legacy services	Mar. 31, 2011 Predecessor Data integration	Mar. 31, 2011 Predecessor Affiliates and other services
Products and Services Revenues
Number of categories of products and services					4
Number of categories into which prior period revenues are classified		4
Number of reportable segments					1
Products and Services Revenues
Total operating revenues	$ 2,825		$ 2,765	$ 5,534	$ 8,500	$ 1,258	$ 1,194	$ 2,388	$ 3,715	$ 1,197	$ 1,299	$ 2,632	$ 3,681	$ 137	$ 134	$ 252	$ 393	$ 233	$ 138	$ 262	$ 711	$ 2,846	$ 1,200	$ 1,400	$ 123	$ 123
USF and surcharges included in operating revenues and expenses	$ 95		$ 91	$ 183	$ 298																	$ 96