Derivatives - BS Location (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	$ 368	$ 256
Fair Value of Derivative Instruments, Liabilities	88	43
Derivatives designated as hedging instruments
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	315	190
Fair Value of Derivative Instruments, Liabilities	8	10
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other current assets
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	204	116
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other assets
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	71	47
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other current liabilities
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Liabilities	4	2
Derivatives designated as hedging instruments | Foreign currency forward/option contracts | Other liabilities
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Liabilities	4	1
Derivatives designated as hedging instruments | Commodity price swap contracts | Other current liabilities
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Liabilities		4
Derivatives designated as hedging instruments | Interest rate swap contracts | Other assets
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	40	27
Derivatives designated as hedging instruments | Interest rate swap contracts | Other liabilities
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Liabilities		3
Derivatives not designated as hedging instruments
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	53	66
Fair Value of Derivative Instruments, Liabilities	80	33
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other current assets
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Assets	53	66
Derivatives not designated as hedging instruments | Foreign currency forward/option contracts | Other current liabilities
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Liabilities	79	$ 33
Derivatives not designated as hedging instruments | Commodity price swap contracts | Other current liabilities
Location and Fair Value Amount of Derivative Instruments
Fair Value of Derivative Instruments, Liabilities	$ 1