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Debt Obligations (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Changes in Debt Obligations
The following table presents the changes in the carrying amount of our debt obligations during the year ended December 31, 2018:
 
December 31, 2017
 
Additions
 
Payments, Accretion
and Other
 
December 31, 2018
Short-term debt:
(in millions)
Commercial paper
$
480

 
$
4,096

 
$
(4,301
)
 
$
275

Senior unsecured floating rate notes due March 22, 2019(1)
498

 
—

 
2

 
500

$400 million senior unsecured term loan facility due November 25, 2019 (average interest rate of 3.48% for the period January 1, 2018 through December 31, 2018)(2)
100

 
—

 
—

 
100

Total short-term debt
1,078

 
4,096

 
(4,299
)
 
875

Long-term debt:
 
 
 
 
 
 
 
5.55% senior unsecured notes due January 15, 2020
599

 
—

 
—

 
599

3.875% senior unsecured notes due June 7, 2021
716

 
—

 
(30
)
 
686

4.25% senior unsecured notes due June 1, 2024
496

 
—

 
1

 
497

1.75% senior unsecured notes due May 19, 2023
712

 
—

 
(30
)
 
682

3.85% senior unsecured notes due June 30, 2026
496

 
—

 
—

 
496

$1 billion revolving credit commitment due April 25, 2022 (average interest rate of 2.74% for the period January 1, 2018 through December 31, 2018)
110

 
—

 
(114
)
 
(4
)
Total long-term debt
3,129

 
—

 
(173
)
 
2,956

Total debt obligations
$
4,207

 
$
4,096

 
$
(4,472
)
 
$
3,831


____________
(1) 
Balance was reclassified to short-term debt as of March 31, 2018.
(2) 
Balance was reclassified to short-term debt as of December 31, 2018.