The Senate approved the landmark health bill early Christmas Eve, a key step for President Obama and the Democrats in moving forward with health overhaul. But the debate is far from over. The $871 billion Senate bill would be paid for by new taxes and cuts to Medicare payments to health care providers. It includes a new insurance marketplace, known as an exchange, bars insurers from discriminating against people with pre-existing conditions, and requires nearly everyone to buy insurance. Next, the Senate and the House have to reconcile their different versions. Below, a look at what the House has passed, the amended Senate bill — and where the two chambers may clash. The likelihood scale is based on how similar the House and Senate bills have been so far.