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Quarterly Financial Data (Unaudited) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Total revenues $ 5,963 $ 5,833 $ 3,225 $ 8,269 $ 9,154 $ 7,886 $ 8,253 $ 8,375 $ 23,290 $ 33,669 $ 34,055
Gross margin 4 313 282 (190) 402 565 525 790 408 2,282  
Operating income/(loss) (67) 251 208 (2,775) 329 490 449 713 (2,383) 1,980 2,272
Net income/(loss) (23) 139 137 (2,692) 291 431 426 914 (2,440) 2,062 2,107
Net income attributable to PAGP (20) 17 16 (581) $ 48 $ 70 $ 66 $ 147 (568) 331 334
Goodwill impairment losses       2,515         2,515 0 $ 0
Non-cash impairment losses upon classification to assets held for sale       167              
Gain on/(impairment of) investments in unconsolidated entities, net                      
Write down of investments   91 $ 69 43              
Gain on/(impairment of) investments in unconsolidated entities, net | Capline Pipeline Company LLC                      
Gain from remeasurement to fair value of retained investment   $ 2   267           $ 269  
(Gains)/losses on asset sales and asset impairments, net                      
Non-cash impairment losses, long-lived assets $ 95     $ 446         $ 541    
Class A Shares                      
Basic net income/(loss) per Class A share (in dollars per share) $ (0.11) $ 0.09 $ 0.09 $ (3.18) $ 0.26 $ 0.41 $ 0.41 $ 0.92 $ (3.06) $ 1.97 $ 2.12
Diluted net income/(loss) per Class A share (in dollars per share) (0.11) 0.09 0.09 (3.18) 0.26 0.41 0.40 0.92 (3.07) 1.96 $ 2.11
Cash distributions per Class A share (in dollars per share) $ 0.18 $ 0.18 $ 0.18 $ 0.36 $ 0.36 $ 0.36 $ 0.36 $ 0.30 $ 0.90 $ 1.38