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Segment Information - Generation Total Revenues (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Segment Reporting Information [Line Items]        
Revenues $ 8,929 $ 9,403 $ 26,096 $ 27,170
Operating revenues from affiliates 0 0 0 0
Generation Mid Atlantic [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,364 1,456 3,809 4,179
Generation Midwest [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,082 1,117 3,224 3,593
Generation New York [Member]        
Segment Reporting Information [Line Items]        
Revenues 429 469 1,211 1,269
Generation ERCOT [Member]        
Segment Reporting Information [Line Items]        
Revenues 365 444 805 930
Generation Other Regions [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,040 1,212 3,254 3,114
Generation Reportable Segments Total [Member]        
Segment Reporting Information [Line Items]        
Revenues 4,280 4,698 12,303 13,085
Generation Natural Gas [Member]        
Segment Reporting Information [Line Items]        
Revenues 299 440 1,541 1,944
Generation All Other Segments [Member]        
Segment Reporting Information [Line Items]        
Revenues 195 140 436 339
Unrealized Gain (Loss) on Securities 77 6 64 96
Generation Total Consolidated Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 4,774 5,278 14,280 15,368
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenues 8,929 9,403 26,096 27,170
Operating Segments [Member] | Generation Mid Atlantic [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,361 1,449 3,807 4,162
Operating Segments [Member] | Generation Midwest [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,099 1,121 3,255 3,601
Operating Segments [Member] | Generation New York [Member]        
Segment Reporting Information [Line Items]        
Revenues 429 469 1,211 1,268
Operating Segments [Member] | Generation ERCOT [Member]        
Segment Reporting Information [Line Items]        
Revenues 360 445 792 929
Operating Segments [Member] | Generation Other Regions [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,065 1,257 3,300 3,230
Operating Segments [Member] | Generation Reportable Segments Total [Member]        
Segment Reporting Information [Line Items]        
Revenues 4,314 4,741 12,365 13,190
Operating Segments [Member] | Generation Natural Gas [Member]        
Segment Reporting Information [Line Items]        
Revenues 265 397 1,479 1,839
Operating Segments [Member] | Generation All Other Segments [Member]        
Segment Reporting Information [Line Items]        
Unrealized Gain (Loss) on Securities 17 71 84 104
Operating Segments [Member] | Generation Total Consolidated Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 4,774 5,278 14,280 15,368
Corporate, Non-Segment [Member] | Generation All Other Segments [Member]        
Segment Reporting Information [Line Items]        
Revenues 195 140 436 339
Intersegment Eliminations [Member]        
Segment Reporting Information [Line Items]        
Revenues (763) (780) (2,296) (2,436)
Operating revenues from affiliates (764) (779) (2,300) (2,430)
Intersegment Eliminations [Member] | Generation Mid Atlantic [Member]        
Segment Reporting Information [Line Items]        
Operating revenues from affiliates 3 7 2 17
Intersegment Eliminations [Member] | Generation Midwest [Member]        
Segment Reporting Information [Line Items]        
Operating revenues from affiliates (17) (4) (31) (8)
Intersegment Eliminations [Member] | Generation New York [Member]        
Segment Reporting Information [Line Items]        
Operating revenues from affiliates 0 0 0 1
Intersegment Eliminations [Member] | Generation ERCOT [Member]        
Segment Reporting Information [Line Items]        
Operating revenues from affiliates 5 (1) 13 1
Intersegment Eliminations [Member] | Generation Other Regions [Member]        
Segment Reporting Information [Line Items]        
Operating revenues from affiliates (25) (45) (46) (116)
Intersegment Eliminations [Member] | Generation Reportable Segments Total [Member]        
Segment Reporting Information [Line Items]        
Operating revenues from affiliates (34) (43) (62) (105)
Intersegment Eliminations [Member] | Generation Natural Gas [Member]        
Segment Reporting Information [Line Items]        
Operating revenues from affiliates 34 43 62 105
Intersegment Eliminations [Member] | Generation All Other Segments [Member]        
Segment Reporting Information [Line Items]        
Operating revenues from affiliates 0 0 0 0
Intersegment Eliminations [Member] | Generation Total Consolidated Group [Member]        
Segment Reporting Information [Line Items]        
Operating revenues from affiliates 0 0 0 0
Revenue from Contract with Customer [Member] | Operating Segments [Member] | Generation Mid Atlantic [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,351 1,397 3,798 3,971
Revenue from Contract with Customer [Member] | Operating Segments [Member] | Generation Midwest [Member]        
Segment Reporting Information [Line Items]        
Revenues 1,052 1,095 3,083 3,432
Revenue from Contract with Customer [Member] | Operating Segments [Member] | Generation New York [Member]        
Segment Reporting Information [Line Items]        
Revenues 414 475 1,195 1,305
Revenue from Contract with Customer [Member] | Operating Segments [Member] | Generation ERCOT [Member]        
Segment Reporting Information [Line Items]        
Revenues 288 156 594 470
Revenue from Contract with Customer [Member] | Operating Segments [Member] | Generation Other Regions [Member]        
Segment Reporting Information [Line Items]        
Revenues 873 959 2,849 2,656
Revenue from Contract with Customer [Member] | Operating Segments [Member] | Generation Reportable Segments Total [Member]        
Segment Reporting Information [Line Items]        
Revenues 3,978 4,082 11,519 11,834
Revenue from Contract with Customer [Member] | Operating Segments [Member] | Generation Natural Gas [Member]        
Segment Reporting Information [Line Items]        
Revenues 160 200 1,041 1,016
Revenue from Contract with Customer [Member] | Operating Segments [Member] | Generation Total Consolidated Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 4,250 4,412 12,903 13,235
Revenue from Contract with Customer [Member] | Corporate, Non-Segment [Member] | Generation All Other Segments [Member]        
Segment Reporting Information [Line Items]        
Revenues 112 130 343 385
Other [Member] | Operating Segments [Member] | Generation Mid Atlantic [Member]        
Segment Reporting Information [Line Items]        
Revenues 10 52 9 191
Other [Member] | Operating Segments [Member] | Generation Midwest [Member]        
Segment Reporting Information [Line Items]        
Revenues 47 26 172 169
Other [Member] | Operating Segments [Member] | Generation New York [Member]        
Segment Reporting Information [Line Items]        
Revenues 15 (6) 16 (37)
Other [Member] | Operating Segments [Member] | Generation ERCOT [Member]        
Segment Reporting Information [Line Items]        
Revenues 72 289 198 459
Other [Member] | Operating Segments [Member] | Generation Other Regions [Member]        
Segment Reporting Information [Line Items]        
Revenues 192 298 451 574
Other [Member] | Operating Segments [Member] | Generation Reportable Segments Total [Member]        
Segment Reporting Information [Line Items]        
Revenues 336 659 846 1,356
Other [Member] | Operating Segments [Member] | Generation Natural Gas [Member]        
Segment Reporting Information [Line Items]        
Revenues 105 197 438 823
Other [Member] | Operating Segments [Member] | Generation Total Consolidated Group [Member]        
Segment Reporting Information [Line Items]        
Revenues 524 866 1,377 2,133
Other [Member] | Corporate, Non-Segment [Member] | Generation All Other Segments [Member]        
Segment Reporting Information [Line Items]        
Revenues $ 83 $ 10 $ 93 $ (46)