Debt (Debt) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt	$ 11,020	$ 10,750
Debt, Current	169	115
Long-term Debt, Excluding Current Maturities	(10,851)	(10,635)
Corporate Debt Securities [Member]
Debt Instrument [Line Items]
Long-term Debt	5,304	5,303
Notes Payable, Other Payables [Member]
Debt Instrument [Line Items]
Long-term Debt	2,450	2,463
Loans Payable [Member]
Debt Instrument [Line Items]
Long-term Debt	1,858	1,789
CCFC Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt	1,197	0
Secured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt	0	978
Capital Lease Obligations [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 211	$ 217