Debt (Details 1) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Debt Instrument [Line Items]
Unamortized Discount	$ (9)		$ (11)
Other Long-term Debt, Noncurrent	6,446	[1]	6,664	[1]
Fair value adjustments	(25)	[2]	(43)	[2]
Amounts due within one year	(68)		(184)
Total long-term debt due after one year	6,394		6,512
Debt Immediately Due If Change In Control	236
Senior Unsecured Notes Due 2013 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	0		114
Debt Instrument, Interest Rate, Stated Percentage	9.125%
Senior Unsecured Notes Due 2015 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	1,000	[3]	1,000	[3]
Debt Instrument, Interest Rate, Stated Percentage	0.90%	[3]
Senior Unsecured Notes Due 2017 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	682	[3]	682	[3]
Debt Instrument, Interest Rate, Stated Percentage	6.00%	[3]
Senior Unsecured Notes Due 2018 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	854	[3]	854	[3]
Debt Instrument, Interest Rate, Stated Percentage	5.90%	[3]
Senior Unsecured Notes Due 2019 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	228	[3]	228	[3]
Debt Instrument, Interest Rate, Stated Percentage	7.50%	[3]
Senior Unsecured Notes Due 2022 [A] [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	1,000	[3]	1,000	[3]
Debt Instrument, Interest Rate, Stated Percentage	2.80%	[3]
Senior Unsecured Notes Due 2022 [B] [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	32		32
Debt Instrument, Interest Rate, Stated Percentage	9.375%
Series A Notes Due 2022 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	3		3
Senior Unsecured Notes Due 2023 [A] [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	70		70
Debt Instrument, Interest Rate, Stated Percentage	8.50%
Senior Unsecured Notes Due 2023 [B] [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	131		131
Debt Instrument, Interest Rate, Stated Percentage	8.125%
Senior Unsecured Notes Due 2032 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	550	[3]	550	[3]
Debt Instrument, Interest Rate, Stated Percentage	6.80%	[3]
Senior Unsecured Notes Due 2037 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	750		750
Debt Instrument, Interest Rate, Stated Percentage	6.60%
Capital Lease Obligation of Consolidated Subsidiary due 2014 - 2049 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	10		11
Promissory Note Due 2014 - 2015 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	136		204
Debt Instrument, Interest Rate, Stated Percentage	4.55%
Obligation Relating To Revenue Bonds Due 2037 [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	1,000		1,000
Debt Instrument, Interest Rate, Stated Percentage	5.125%
Other Obligations [Member]
Debt Instrument [Line Items]
Other Long-term Debt, Noncurrent	$ 0		$ 35

[1] In the event of a change in control, as defined in the related agreements, debt obligations totaling $236 million at December 31, 2013, may be declared immediately due and payable.

[2] See Notes 15 and 16 for information on interest rate swaps.

[3] These notes contain a make-whole provision allowing us the right to repay the debt at a premium to market price.