Internet Records are not the same as Phone Call Records
"Motta said the Feds simply want to keep powers they already have - since 1986 phone companies have been obliged to keep records of who makes calls, who they call, when they call and how long the call lasts. It's just that now, the Feds want to explicity include web activity as well. He said the FBI did not want to store the actual content of calls or emails."
The phone records that are being referred to are needed to bill for the use of the Telephone system (and thus the Feds are just asking for information that the Telco is creating for its own operation anyway). For a land line, there is tracking of out-of-area (ie: Long Distance) calls and possibly local calls (or there used to be when there was message-units/measured-service). With Cell Phones, EVERY Call is logged and reported on your monthly bill since you are charged for use.
In the case of the Internet sessions, there is no need for any records of USAGE/CONNECTIONS, only what IPN has been assigned (by a DHCP Server) to the customer's Modem (and when the IPN was assigned so it is know who address x.x.x.x was on such-and-such a Date and Time). Even if there is a cap on usage, all that is monitored is an aggregate amount of usage (ie: You downloaded/uploaded so much data) not a list of each session.