Liquidity Considerations Liquidiity Considerations - Additional Information (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Liquidity Considerations [Abstract]
Long-term Debt, Gross	$ 7,167	$ 25,600
Contractual Obligation, Future Minimum Payments Due, Remainder of Fiscal Year	337
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year	47
Long Term Debt Interest Repayment Remainder of Year	290
Contractual Obligation, Due in Second Year	773
Long-term Debt, Maturities, Repayments of Principal in Year Two	202
Long Term Debt Interest Repayments In Year Two	$ 571