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New Accounting Standard (Unaudited) (Tables)
 3 Months Ended
Mar. 31, 2018
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]  
Impact of Adopting New Accounting Standards
The impact of adopting this ASU for the three months ended March 31, 2017, follows (in millions):
 
 
Previously Reported
 
Impact of Adoption
 
Current Presentation
Production and delivery
 
$
2,200

 
$
(12
)
 
$
2,188

Total cost of sales
 
2,589

 
(12
)
 
2,577

Selling, general and administrative expenses
 
153

 
(2
)
 
151

Mining exploration and research expenses
 
15

 
(1
)
 
14

Environmental obligations and shutdown costs
 
27

 
(2
)
 
25

Total costs and expenses
 
2,761

 
(17
)
 
2,744

Operating income
 
580

 
17

 
597

Other income, net
 
25

 
(17
)
 
8

The impact of adopting this ASU for the three months ended March 31, 2017, follows (in millions):
 
 
Previously Reported
 
Impact of Adoption
 
Current Presentation
Other, net included in cash flow from investing activities
 
$
(21
)
 
$
4

 
$
(17
)
Cash flow from investing activities
 
(365
)
 
4

 
(361
)
Net decrease in cash, cash equivalents, restricted cash and restricted cash equivalents
 
(252
)
 
4

 
(248
)
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year
 
4,245

 
158

 
4,403

Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period
 
4,001

 
162

 
4,163