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Related Party Transactions (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2016
Nov. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Oxy | Class A Shares          
Related Party Transactions          
Shares issued in connection with Exchange Right exercises (in shares)   25,910,938      
BridgeTex Pipeline Company, LLC (BridgeTex)          
Related Party Transactions          
Interest acquired         50.00%
Ownership interest 50.00%   50.00%    
BridgeTex Pipeline Company, LLC (BridgeTex) | Oxy          
Related Party Transactions          
Interest acquired   50.00%      
PAA | Class C Shares          
Related Party Transactions          
Class C shares held by PAA 491,910,863        
Oxy          
Related Party Transactions          
Revenues     $ 655 $ 866 $ 1,212
Purchases and related costs     42 41 925
Trade accounts receivable and other receivables $ 789   789 405  
Accounts payable $ 836   836 363  
Oxy | AAP          
Related Party Transactions          
Limited partner interest 13.00%        
Equity Method Investees          
Related Party Transactions          
Revenues     14 17 3
Trade accounts receivable and other receivables $ 39   39 14  
Prepaid tariff costs 14   14    
Accounts payable $ 35   35 25  
Costs related to services utilized     $ 209 $ 164 $ 75
Equity Method Investees | Agreement to Transport Crude Oil          
Related Party Transactions          
Ownership interest 50.00%   50.00%