Long-Term Debt, Financing and Capital Lease Obligations Long-Term Debt, Financing and Capital Lease Obligations (Schedule of Maturities of Long-term Debt) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013
Schedule of Maturities of Long-term Debt [Line Items]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 994
Long-term Debt, Maturities, Repayments of Principal in Year Two	857
Long-term Debt, Maturities, Repayments of Principal in Year Three	2,622
Long-term Debt, Maturities, Repayments of Principal in Year Four	2,489
Long-term Debt, Maturities, Repayments of Principal in Year Five	3,047
Long-term Debt, Maturities, Repayments of Principal after Year Five	21,520
Long-term Debt	31,529
Debt Instrument, Unamortized Discount (Premium), Net	1,482
Current and Long-term Debt, Financing and Capital Lease Obligations	$ 33,011