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New Accounting Standard (Unaudited) (Tables)
 6 Months Ended
Jun. 30, 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- and six-month periods ended June 30, 2017, follows (in millions):
 
 
Three Months Ended June 30, 2017
 
 
Previously Reported
 
Impact of Adoption
 
Current Presentation
Production and delivery
 
$
2,495

 
$
(15
)
 
$
2,480

Total cost of sales
 
2,945

 
(15
)
 
2,930

Environmental obligations and shutdown costs
 
(19
)
 
(2
)
 
(21
)
Total costs and expenses
 
3,042

 
(17
)
 
3,025

Operating income
 
669

 
17

 
686

Other (expense) income, net
 
10

 
(17
)
 
(7
)
 
 
Six Months Ended June 30, 2017
 
 
Previously Reported
 
Impact of Adoption
 
Current Presentation
Production and delivery
 
$
4,695

 
$
(27
)
 
$
4,668

Total cost of sales
 
5,534

 
(27
)
 
5,507

Selling, general and administrative expenses
 
260

 
(2
)
 
258

Mining exploration and research expenses
 
34

 
(1
)
 
33

Environmental obligations and shutdown costs
 
8

 
(4
)
 
4

Total costs and expenses
 
5,803

 
(34
)
 
5,769

Operating income
 
1,249

 
34

 
1,283

Other income, net
 
34

 
(34
)
 
—

The impact of adopting this ASU for the six months ended June 30, 2017, follows (in millions):
 
 
Previously Reported
 
Impact of Adoption
 
Current Presentation
Other, net included in cash flow from investing activities
 
$
(4
)
 
$
7

 
$
3

Cash flow from investing activities
 
(710
)
 
7

 
(703
)
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents
 
415

 
7

 
422

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
 
4,667

 
165

 
4,832