Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 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 approximates par value since the interest rates on this short-term debt approximate market rates as of March 31, 2019.

	As of March 31, 2019
	Carrying Amount		Fair value
Debt:	In Millions
Commercial Paper	$	1,005	$	1,008
2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)	1,247		1,252
2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)	496		493
2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)	397		411
2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)	793		841
2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)	1,243		1,302
2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)	496		497
2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)	592		624
2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)	1,228		1,317
Total debt	$	7,497	$	7,745