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Debt Obligations (Tables)
 12 Months Ended
Dec. 31, 2016
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, 2016:
 
December 31, 2015
 
Additions
 
Payments, Accretion
and Other
 
December 31, 2016
 
(in millions)
5.55% senior unsecured notes due January 15, 2020
$
597

 
$
—

 
$
1

 
$
598

5.25% senior unsecured notes due January 16, 2018
368

 
—

 
1

 
369

3.875% senior unsecured notes due June 7, 2021
646

 
—

 
(21
)
 
625

4.25% senior unsecured notes due June 1, 2024
495

 
—

 
—

 
495

1.75% senior unsecured notes due May 19, 2023
—

 
664

 
(42
)
 
622

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 2.00% for the period March 17, 2016 through December 31, 2016)
—

 
399

 
—

 
399

$750 million revolving credit commitment due November 25, 2019 (average interest rate of 1.63% for the period January 1, 2016 through December 31, 2016)
258

 
898

 
(1,156
)
 
—

Total long-term debt obligations
$
2,364

 
$
2,456

 
$
(1,217
)
 
$
3,603