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Debt Obligations (Tables)
 3 Months Ended
Mar. 31, 2017
Debt Disclosure [Abstract]  
Changes in Debt Obligations
The following table presents the changes in the carrying amount of our debt obligations during the three months ended March 31, 2017:
 
December 31, 2016
 
Additions
 
Payments, Accretion
and Other
 
March 31, 2017
 
(in millions)
5.55% senior unsecured notes due January 15, 2020
$
598

 
$
—

 
$
—

 
$
598

5.25% senior unsecured notes due January 16, 2018
369

 
—

 
—

 
369

3.875% senior unsecured notes due June 7, 2021
625

 
—

 
8

 
633

4.25% senior unsecured notes due June 1, 2024
495

 
—

 
1

 
496

1.75% senior unsecured notes due May 19, 2023
622

 
—

 
9

 
631

3.85% senior unsecured notes due June 30, 2026
495

 
—

 
—

 
495

$400 million senior unsecured term loan facility due November 25, 2019 (average interest rate of 2.28% for the period January 1, 2017 through March 31, 2017)
399

 
—

 
—

 
399

$750 million revolving credit commitment due November 25, 2019 (average interest rate of 0.00% for the period January 1, 2017 through March 31, 2017)
—

 
—

 
—

 
—

Total debt obligations
3,603

 
—

 
18

 
3,621

Less current portion
—

 
—

 
—

 
(379
)
Total long-term debt obligations
$
3,603

 
$
—

 
$
18

 
$
3,242