Long-term and Short-term Debt (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Long-term and Short-term Debt [Abstract]
Commercial Paper	$ 100	$ 101
Short-term Debt, average daily balance	119	447
Short-term Debt Average Days Outstanding	40 days	19 days
Short-term Debt [Line Items]
Short-term debt	100	686
Federal Home Loan Bank of New York [Member]
Short-term Debt [Line Items]
Federal Home Loan Bank, Advances, Short-term	$ 0	$ 585