Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Fair Value Disclosures [Abstract]

Schedule of Carrying Values and Estimated Fair Values of Debt Instruments

The fair values of our fixed rate notes were estimated using quoted market prices for these instruments. The fair value of our commercial paper and other short-term debt approximates par value since the interest rates on this short-term debt approximate market rates as of June 30, 2019.

	As of June 30, 2019
	(in millions)
Debt:	Carrying Amount		Fair value
Commercial Paper	$	1,298	$	1,303
Other short-term debt	5		5
2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)	1,247		1,258
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)	497		501
2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)	397		417
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)	794		851
2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)	1,243		1,336
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)	496		514
2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)	591		646
2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)	1,229		1,406
Total debt	$	7,797	$	8,237