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Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Debt
DEBT AND EQUITY

The components of debt follow (in millions):
 
 
June 30,
2018
 
December 31, 2017
Senior notes and debentures:
 
 
 
 
Issued by FCX
 
$
9,594

 
$
11,429

Issued by Freeport Minerals Corporation (FMC)
 
358

 
358

Issued by Freeport-McMoRan Oil & Gas LLC (FM O&G LLC)
 
—

 
54

Cerro Verde credit facility
 
1,171

 
1,269

Other
 
4

 
7

Total debta
 
11,127

 
13,117

Less current portion of debt
 
(4
)
 
(1,414
)
Long-term debt
 
$
11,123

 
$
11,703


a.
Includes additions for unamortized fair value adjustments totaling $63 million at June 30, 2018 ($97 million at December 31, 2017), and is net of reductions for unamortized net discounts and unamortized debt issuance costs totaling $76 million at June 30, 2018 ($85 million at December 31, 2017).
Schedule of Extinguishment of Debt [Table Text Block]
A summary of these redemptions follows (in millions):
 
 
 
 
 
 
 
 
 
 
 
Principal Amount
 
Net Adjustments
 
Book Value
 
Redemption Value
 
Gain
FCX 6.75% Senior Notes due 2022
$
404

 
$
22

 
$
426

 
$
418

 
$
8

FM O&G LLC 67/8% Senior Notes due 2023
50

 
4

 
54

 
52

 
2

 
$
454

 
$
26

 
$
480

 
$
470

 
$
10