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Summary of Principal Accounting Policies Summary of Principal Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles
The following tables summarize the impacts of adopting the new revenue standard on our consolidated income statement for the year ended December 31, 2018.
 
Year Ended December 31, 2018
(In millions)
As reported
Adjustments
Presentation without adoption of ASC Topic 606
Revenues and other income:
 
 
 
Revenues from contracts with customers
$
5,902

$
(12
)
$
5,890

Marketing revenues
—

159

159

Other income
150

(5
)
145

Costs and expenses:
 
 
 
Marketing, including purchases from related parties
$
—

$
158

$
158

Shipping, handling and other operating
575

(16
)
559

The following tables summarize the impacts of adopting this standard on our historical consolidated income statement for the years ended December 31, 2017 and 2016.
 
Year Ended December 31, 2017
(In millions)
Previously Reported
As reclassified
Effect of Change Higher/(Lower)
Production
$
706

$
716

$
10

Exploration
409

409

—

General and administrative
400

371

(29
)
   Income (loss) from operations
(133
)
(114
)
19

Other net periodic benefit costs(a)
—

(19
)
(19
)
 
Year Ended December 31, 2016
(In millions)
Previously Reported
As reclassified
Effect of Change Higher/(Lower)
Production
$
712

$
720

$
8

Exploration
323

323

—

General and administrative
481

371

(110
)
   Income (loss) from operations
(832
)
(730
)
102

Other net periodic benefit costs(a)
—

(102
)
(102
)
(a) Includes net settlement loss and other net periodic benefit costs, excluding service costs (See Note 18).