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Fair Value of Financial Instruments Fair value by balance sheet grouping table (Tables)
9 Months Ended
Sep. 30, 2017
Fair Value Disclosures [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The carrying amount and fair value of our total debt, including short-term borrowings and current maturities of long-term debt, is as follows:
 
September 30, 2017
 
December 31, 2016
Millions of dollars
Level 1
Level 2
Total fair value
Carrying value
 
Level 1
Level 2
Total fair value
Carrying value
Total debt
$
345

$
11,906

$
12,251

$
10,938

 
$
753

$
12,812

$
13,565

$
12,384