Long-Term Debt (Extinguishment of Debt) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Extinguishment of Debt [Line Items]
Debt tender premiums and fees									$ 1,054	$ 864
Write-off of unamortized debt discounts and debt issuance costs									30	10
Pre-tax Loss On Early Extinguishment of Debt	(1,084)	0	0	0	0	(874)	0	0	(1,084)	(874)	0
Senior Notes [Member]
Extinguishment of Debt [Line Items]
Notes purchased	2,100					2,000			2,100	2,000
9.95% Note [Member] | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Notes purchased									818	0
Stated interest rate	9.95%				9.95%				9.95%	9.95%
10.20% Note [Member] | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Notes purchased									782	0
Stated interest rate	10.20%				10.20%				10.20%	10.20%
9.70% Note[Member] | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Notes purchased									293	1,151
Stated interest rate	9.70%				9.70%				9.70%	9.70%
9.25% Note [Member] | Senior Notes [Member]
Extinguishment of Debt [Line Items]
Notes purchased									$ 207	$ 849
Stated interest rate	9.25%				9.25%				9.25%	9.25%