Long-term Debt (Details Textual) (USD $)	3 Months Ended
	Mar. 31, 2011	Mar. 31, 2012	Dec. 31, 2011
Long-term Debt (Additional Textual) [Abstract]
Long-term debt, carrying amount		$ 8,439,000,000	$ 8,548,000,000
Long-term Debt (Textual) [Abstract]
Repurchase of senior notes	1,260,000,000
Long-term debt, fair value		8,800,000,000	8,900,000,000
3.300% Senior Notes due 2021 [Member]
Long-term Debt (Additional Textual) [Abstract]
Long-term debt, carrying amount		1,595,000,000	1,595,000,000
4.50% Guaranteed Notes due 2014 [Member]
Long-term Debt (Additional Textual) [Abstract]
Long-term debt, carrying amount		1,343,000,000	1,290,000,000
2.75% Guaranteed Notes due 2015 [Member]
Long-term Debt (Additional Textual) [Abstract]
Long-term debt, carrying amount		1,336,000,000	1,297,000,000
1.950% Senior Notes due 2016 [Member]
Long-term Debt (Additional Textual) [Abstract]
Long-term debt, carrying amount		1,099,000,000	1,099,000,000
4.200% Senior Notes due 2021 [Member]
Long-term Debt (Additional Textual) [Abstract]
Debt instrument interest rate		4.20%
Face amount of debt instrument	1,100,000,000
5.25% Guaranteed Notes due 2013 [Member]
Long-term Debt (Additional Textual) [Abstract]
Long-term debt, carrying amount		671,000,000	649,000,000
2.650% Senior Notes due 2016 [Member]
Long-term Debt (Additional Textual) [Abstract]
Debt instrument interest rate		2.65%
Effective interest rate on euro denominated debt		2.39%
Face amount of debt instrument	500,000,000
Long-term debt, carrying amount		498,000,000	498,000,000
3.00% Guaranteed Notes due 2013 [Member]
Long-term Debt (Additional Textual) [Abstract]
Long-term debt, carrying amount			450,000,000
Floating Rate Senior Notes due 2014 [Member]
Long-term Debt (Additional Textual) [Abstract]
Long-term debt, carrying amount		300,000,000	300,000,000
9.75% Senior Notes due 2019 [Member]
Long-term Debt (Additional Textual) [Abstract]
Debt instrument interest rate		9.75%
8.625% Senior Notes due 2014 [Member]
Long-term Debt (Additional Textual) [Abstract]
Debt instrument interest rate		8.625%
6.00% Senior Notes due 2016 [Member]
Long-term Debt (Additional Textual) [Abstract]
Debt instrument interest rate		6.00%
4.200% Guaranteed Notes due 2021 [Member]
Long-term Debt (Additional Textual) [Abstract]
Long-term debt, carrying amount		$ 1,099,000,000	$ 1,099,000,000