Fair Value Measurements and Financial Instruments (Details 4) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 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	$ 28	$ (4)	$ 28	$ 272
Bonds Issued By Venezuelan Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities	421	$ 447	421	$ 447	$ 399	$ 685
Other Current Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities	248		248		200
Notes Receivable, Fair Value Disclosure	38		38		42
Other Assets [Member]
Schedule of Available-for-sale Securities [Line Items]
Held-to-maturity Securities, Noncurrent	35		35
Fair Value, Inputs, Level 1 [Member] | Other Current Assets [Member] | Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Marketable Securities	218		218
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	73		73
Fair Value of fixed interest rate bonds	348		348
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	30		30
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	$ 391		$ 391		$ 322