Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Measurements

Fair Value, Assets and Liabilities Measured on Recurring Basis

			Fair Value Measurements
(Millions)	Fair Value at		Using Inputs Considered as
Description	December 31, 2015		Level 1		Level 2		Level 3
Assets:
Available-for-sale:
Marketable securities:
Foreign government agency securities	$	10	$	—	$	10	$	—
Corporate debt securities		10		—		10		—
Commercial paper		12		—		12		—
Certificates of deposit/time deposits		26		—		26		—
Asset-backed securities:
Automobile loan related		26		—		26		—
Credit card related		10		—		10		—
Equipment lease related		2		—		2		—
Other		19		—		19		—
U.S. municipal securities		12		—		—		12
Derivative instruments — assets:
Foreign currency forward/option contracts		272		—		272		—
Interest rate swap contracts		24		—		24		—
Liabilities:
Derivative instruments — liabilities:
Foreign currency forward/option contracts		68		—		68		—
Interest rate swap contracts		1		—		1		—

			Fair Value Measurements
(Millions)	Fair Value at		Using Inputs Considered as
Description	December 31, 2014		Level 1		Level 2		Level 3
Assets:
Available-for-sale:
Marketable securities:
U.S. government agency securities	$	108	$	—	$	108	$	—
Foreign government agency securities		95		—		95		—
Corporate debt securities		619		—		619		—
Certificates of deposit/time deposits		41		—		41		—
Asset-backed securities:
Automobile loan related		282		—		282		—
Credit card related		162		—		162		—
Equipment lease related		48		—		48		—
Other		46		—		46		—
U.S. treasury securities		38		38		—		—
U.S. municipal securities		15		—		—		15
Investments		1		1		—		—
Derivative instruments — assets:
Foreign currency forward/option contracts		229		—		229		—
Interest rate swap contracts		27		—		27		—
Liabilities:
Derivative instruments — liabilities:
Foreign currency forward/option contracts		36		—		36		—
Commodity price swap contracts		4		—		4		—
Interest rate swap contracts		3		—		3		—

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation

(Millions)
Marketable securities — certain U.S. municipal securities and auction rate
securities only	2015		2014		2013
Beginning balance	$	15	$	11	$	7
Total gains or losses:
Included in earnings		—		(1)		—
Included in other comprehensive income		—		2		4
Purchases and issuances		—		15		—
Sales and settlements		(3)		(12)		—
Transfers in and/or out of level 3		—		—		—
Ending balance		12		15		11
Change in unrealized gains or losses for the period included in earnings for securities held at the end of the reporting period		—		—		—

Fair Value of Financial Instruments by Balance Sheet Grouping

	December 31, 2015				December 31, 2014
	Carrying		Fair		Carrying		Fair
(Millions)	Value		Value		Value		Value
Medium-term fixed rate note due September 2016 (long-term in 2014 and short-term in 2015)	$	999	$	1,003	$	996	$	1,014
Long-term debt, excluding current portion and medium-term fixed rate note due September 2016		8,753		9,101		5,709		6,189