Segment Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 segment entity	Mar. 31, 2011
Segment information
Expenses	$ 3,956	$ 1,232
Net income	654	464
Number of operating segments	4
Number of organizations	2
Operating segments
Segment information
Revenues	4,344	1,565
Expenses	1,990	582
Net income	2,354	983
Margin percentage	54.00%	63.00%
Regional markets
Segment information
Revenues	2,204	1,119
Expenses	922	433
Net income	1,282	686
Margin percentage	58.00%	61.00%
Business markets
Segment information
Revenues	917	64
Expenses	581	28
Net income	336	36
Margin percentage	37.00%	56.00%
Wholesale markets
Segment information
Revenues	957	382
Expenses	278	121
Net income	679	261
Margin percentage	71.00%	68.00%
Savvis operations
Segment information
Revenues	266
Expenses	209
Net income	$ 57
Margin percentage	21.00%
Number of operating segments	2