Wall Street banks handed back a record amount of capital to shareholders as surging profit and relaxing capital rules gave executives the confidence to ramp up stock buybacks. Morgan Stanley’s debt bankers increased revenue 93% in the fourth quarter, by far the biggest jump on Wall Street and capping a record year for that business. Goldman Sachs Group Inc. blew through expectations for equities-trading revenue, posting an all-time Wall Street record of $4.31 billion in the final three months