Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Measurements

Fair Value, Assets and Liabilities Measured on Recurring Basis

			Fair Value Measurements
Description	Fair Value at		Using Inputs Considered as
(Millions)	December 31, 2018		Level 1		Level 2		Level 3
Assets:
Available-for-sale:
Marketable securities:
Commercial paper	$	366	$	—	$	366	$	—
Certificates of deposit/time deposits		10		—		10		—
Asset-backed securities:
Automobile loan related		1		—		1		—
U.S. municipal securities		40		—		—		40
Derivative instruments — assets:
Foreign currency forward/option contracts		127		—		127		—
Interest rate swap contracts		19		—		19		—
Liabilities:
Derivative instruments — liabilities:
Foreign currency forward/option contracts		22		—		22		—
Interest rate swap contracts		31		—		31		—

			Fair Value Measurements
Description	Fair Value at		Using Inputs Considered as
(Millions)	December 31, 2017		Level 1		Level 2		Level 3
Assets:
Available-for-sale:
Marketable securities:
Corporate debt securities	$	14	$	—	$	14	$	—
Commercial paper		899		—		899		—
Certificates of deposit/time deposits		76		—		76		—
Asset-backed securities:
Automobile loan related		16		—		16		—
Credit card related		68		—		68		—
U.S. municipal securities		30		—		—		30
Derivative instruments — assets:
Foreign currency forward/option contracts		57		—		57		—
Interest rate swap contracts		21		—		21		—
Liabilities:
Derivative instruments — liabilities:
Foreign currency forward/option contracts		190		—		190		—
Interest rate swap contracts		7		—		7		—

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

Marketable securities — certain U.S. municipal securities only
(Millions)	2018		2017		2016
Beginning balance	$	30	$	20	$	12
Total gains or losses:
Included in earnings		—		—		—
Included in other comprehensive income		—		—		—
Purchases and issuances		13		13		12
Sales and settlements		(3)		(3)		(4)
Transfers in and/or out of level 3		—		—		—
Ending balance		40		30		20
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, 2018				December 31, 2017
	Carrying		Fair		Carrying		Fair
(Millions)	Value		Value		Value		Value
Long-term debt, excluding current portion	$	13,411	$	13,586	$	12,096	$	12,535