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Stock-Based Compensation Plans (Narrative) (Detail) (USD $)
 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2011
Stock Options [Member]
Dec. 31, 2013
Stock Options [Member]
Dec. 31, 2012
Stock Options [Member]
Dec. 31, 2013
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2013
Restricted Stock Awards and Restricted Stock Units [Member]
Dec. 31, 2013
Performance Units [Member]
Dec. 31, 2013
Performance Unit Awards [Member]
Dec. 31, 2012
Performance Unit Awards [Member]
Dec. 31, 2011
Restricted Stock [Member]
Dec. 31, 2013
Restricted Stock [Member]
Dec. 31, 2012
Restricted Stock [Member]
Dec. 31, 2011
Restricted Stock Units [Member]
Dec. 31, 2013
Restricted Stock Units [Member]
Dec. 31, 2012
Restricted Stock Units [Member]
Dec. 31, 2013
Restricted Stock Units [Member]
Non-Employee Directors [Member]
Jun. 30, 2011
Predecessor [Member]
Jun. 30, 2011
Predecessor [Member]
Restricted Stock [Member]
Jun. 30, 2011
Predecessor [Member]
Restricted Stock Units [Member]
Dec. 31, 2013
MPC 2007 and 2003 Plans [Member]
Employees
Jun. 30, 2011
MPC 2007 and 2003 Plans [Member]
Predecessor [Member]
Stock Options [Member]
Dec. 31, 2013
MPC 2011 Plan [Member]
Performance Units [Member]
Dec. 31, 2013
MPC 2012 and 2011 Plans [Member]
Performance Units [Member]
Dec. 31, 2011
Maximum [Member]
Dec. 31, 2013
Maximum [Member]
Stock Options [Member]
Dec. 31, 2013
Maximum [Member]
Stock Appreciation Rights (SARs) [Member]
Dec. 31, 2013
Maximum [Member]
Performance Units [Member]
Dec. 31, 2013
Maximum [Member]
MPC 2012 Plan [Member]
Dec. 31, 2013
Maximum [Member]
MPC 2012 Plan [Member]
Awards Other Than Stock Options Or Stock Appreciation Rights [Member]
Dec. 31, 2013
Maximum [Member]
MPC 2012 Plan [Member]
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                                  
Number of shares of common stock authorized to be delivered under the compensation plan                                                             25,000,000 10,000,000 10,000,000
Number of employees affected by adjustment and substitution of awards                                             393                    
Stock options maximum term, in years                                                       10 years 10 years        
Vesting period of awards             3 years 3 years 3 years                               30 months 36 months              
Restricted stock and restricted stock unit awards granted in 2012, additional holding period                 1 year                                                
Target payout                   $ 1.00                                              
Actual payout                                                           $ 2.00      
Target payout percentage                                                           200.00%      
Pay-out percentage in MPC common stock (in percentage)                                                   25.00%              
Pay-out percentage in cash (in percentage)                                                   75.00%              
Grant date fair value                     $ 1.12 $ 1.09 $ 41.54 $ 87.06 $ 43.11 $ 33.78 $ 73.48 $ 44.38     $ 48.53 $ 45.22                      
Total employee stock-based compensation expense   $ 42,000,000 $ 35,000,000 $ 28,000,000                                                          
Total related income tax benefits   15,000,000 13,000,000 11,000,000                                                          
Cash received upon exercise of stock option awards 1,000,000 48,000,000 108,000,000                                 17,000,000                          
Tax benefits realized by MPC for deductions for stock awards exercised   18,000,000 16,000,000                                 7,000,000             1,000,000            
Share-based compensation arrangement by share-based payment award fair value assumptions expected volatility rate - Company stock weighting   33.00%       33.00%                                                      
Share-based compensation arrangement by share-based payment award fair value assumptions expected volatility rate - Peer stock weighting   67.00%       67.00%                                                      
Intrinsic value of options exercised         1,000,000 60,000,000 37,000,000                                 18,000,000                  
Unrecognized compensation cost           7,000,000               24,000,000     0                                
Weighted average recognition period, in years           8 months 12 days               1 year 3 months 18 days                                      
Restricted units outstanding                                 385,079                                
Restricted units vested                                     383,953                            
Weighted average fair value, vested                                     $ 33.89                            
Shares issued in period                     41,671