Fair Value Measurements and Financial Instruments (Details 4) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Loss (gain) related to the remeasurement of fixed interest rate and devaluation-protected bonds in Venezuela	$ 22	$ 52	$ 50	$ 324
Bonds Issued By Venezuelan Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	408	$ 385	408	$ 385	$ 399	$ 685
Other Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities	146		146		200
Note Receivable, Fair Value Disclosure	36		36		42
Other Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Noncurrent	48		48
Held-to-maturity Securities, Fair Value	53		53
Fair Value, Inputs, Level 1 [Member] | Other Current Assets [Member] | Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities	108		108
Fair Value, Inputs, Level 2 [Member] | Bonds Issued By Venezuelan Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair Value of U.S. dollar-linked, devaluation-protected bonds	64		64
Fair Value of fixed interest rate bonds	344		344
Fair Value, Inputs, Level 2 [Member] | Other Current Assets [Member] | Bonds Issued By Venezuelan Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities	38		38
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Other Assets [Member] | Bonds Issued By Venezuelan Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	$ 370		$ 370		$ 322