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Fair Value Measurements (Tables)
 9 Months Ended
Sep. 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 includes a discount and other short-term debt approximates par value since the interest rates on this short-term debt approximate market rates as of September 30, 2019.
 
As of September 30, 2019
 
(in millions)
Debt:
Carrying Amount
 
Fair value
Commercial Paper
$
1,318

 
$
1,323

Other short-term debt
11

 
11

2020 Senior Notes (2.75% senior unsecured notes due December 1, 2020)
1,247

 
1,260

2022 Senior Notes (2.35% senior unsecured notes due September 15, 2022)
497

 
505

2023 Senior Notes (3.45% senior unsecured notes due September 21, 2023)
397

 
419

2023 Senior Notes (4.00% senior unsecured notes due October 15, 2023)
794

 
855

2025 Senior Notes (3.75% senior unsecured notes due December 1, 2025)
1,244

 
1,349

2027 Senior Notes (3.10% senior unsecured notes due September 15, 2027)
496

 
524

2028 Senior Notes (3.75% senior unsecured notes due September 21, 2028)
592

 
660

2048 Senior Notes (4.25% senior unsecured notes due September 21, 2048)
1,229

 
1,493

Total debt
$
7,825

 
$
8,399