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Financial and Derivative Instruments (Tables)
 12 Months Ended
Dec. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Consolidated Balance Sheet: Fair Value of Derivatives not Designated as Hedging Instruments
Consolidated Balance Sheet: Fair Value of Derivatives Not Designated as Hedging Instruments
 
 
 
 
 
At December 31

Type of Contract
Balance Sheet Classification
2019

 
 
2018

Commodity
Accounts and notes receivable, net
$
11

 
 
$
279

Commodity
Long-term receivables, net
—

 
 
4

Total assets at fair value
$
11

 
 
$
283

Commodity
Accounts payable
$
74

 
 
$
12

Commodity
Deferred credits and other noncurrent obligations
—

 
 
—

Total liabilities at fair value
$
74

 
 
$
12
Consolidated Statement of Income: The Effect of Derivatives not Designated as Hedging Instruments
Consolidated Statement of Income: The Effect of Derivatives Not Designated as Hedging Instruments
 
 
Gain/(Loss)
 
Type of Derivative
Statement of
Year ended December 31
 
Contract
Income Classification
2019

 
 
2018

 
2017

Commodity
Sales and other operating revenues
$
(291
)
 
 
$
135

 
$
(105
)
Commodity
Purchased crude oil and products
(17
)
 
 
(33
)
 
(9
)
Commodity
Other income
(2
)
 
 
3

 
(2
)
 
 
$
(310
)
 
 
$
105

 
$
(116
)
Consolidated Balance Sheet: The Effect of Netting Derivative Assets
The table below represents gross and net derivative assets and liabilities subject to netting agreements on the Consolidated Balance Sheet at December 31, 2019 and December 31, 2018.
Consolidated Balance Sheet: The Effect of Netting Derivative Assets and Liabilities
 
 
Gross Amounts Recognized

 
Gross Amounts Offset

 
Net Amounts Presented

 
 Gross Amounts Not Offset

 
Net Amounts

At December 31, 2019
 
 
 
 
 
Derivative Assets
 
$
656

 
$
645

 
$
11

 
$
—

 
$
11

Derivative Liabilities
 
$
719

 
$
645

 
$
74

 
$
—

 
$
74

At December 31, 2018
 
 
 
 
 
 
 
 
 
 
Derivative Assets
 
$
3,685

 
$
3,402

 
$
283

 
$
—

 
$
283

Derivative Liabilities
 
$
3,414

 
$
3,402

 
$
12

 
$
—

 
$
12

 
 
 
 
 
 
 
 
 
 
 
Consolidated Balance Sheet: The Effect of Netting Derivative Liabilities
The table below represents gross and net derivative assets and liabilities subject to netting agreements on the Consolidated Balance Sheet at December 31, 2019 and December 31, 2018.
Consolidated Balance Sheet: The Effect of Netting Derivative Assets and Liabilities
 
 
Gross Amounts Recognized

 
Gross Amounts Offset

 
Net Amounts Presented

 
 Gross Amounts Not Offset

 
Net Amounts

At December 31, 2019
 
 
 
 
 
Derivative Assets
 
$
656

 
$
645

 
$
11

 
$
—

 
$
11

Derivative Liabilities
 
$
719

 
$
645

 
$
74

 
$
—

 
$
74

At December 31, 2018
 
 
 
 
 
 
 
 
 
 
Derivative Assets
 
$
3,685

 
$
3,402

 
$
283

 
$
—

 
$
283

Derivative Liabilities
 
$
3,414

 
$
3,402

 
$
12

 
$
—

 
$
12