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Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | $ 13,804 | $ 15,631 | $ 17,700
Total revenues | 14,779 | 13,728 | 12,077
Unrealized mark-to-market net (gains) losses on interest rate swaps | (36) | 250 | 134
Unrealized gain loss on commodity related derivatives | 490 | (2,510) | (759)
Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized mark-to-market net (gains) losses on interest rate swaps | 714 | (2,163) | (1,191)
Unrealized gain loss on commodity related derivatives |  | (2,163) | (1,191)
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Total revenues | (6,576) | (4,754) | (2,284)
Corporate and Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 2 | 1 | 0
Corporate and Other | Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized gain loss on commodity related derivatives | 0 | 0 | 0
Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | (6,578) | (4,755) | (2,284)
Unrealized gain loss on commodity related derivatives | 714 |  |
Eliminations | Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized gain loss on commodity related derivatives | (760) | 819 | 1,719
Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 9,316 | 9,110 | 7,988
Total revenues | 10,572 | 9,455 | 7,871
Retail | Operating Segments | Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized gain loss on commodity related derivatives | 191 | (532) | (325)
Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 1,565 | 1,801 | 6,110
Total revenues | 3,823 | 3,733 | 2,790
Texas | Operating Segments | Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized gain loss on commodity related derivatives | (758) | (1,472) | (1,272)
Unrealized gain (loss) on derivatives affiliated | (62) | (817) | (1,028)
East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 1,747 | 2,335 | 1,366
Total revenues | 4,215 | 3,706 | 2,587
East | Operating Segments | Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized gain loss on commodity related derivatives | 1,165 | (757) | (637)
Unrealized gain (loss) on derivatives affiliated | 641 | (38) | (529)
West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 600 | 618 | 334
Total revenues | 914 | 336 | 374
West | Operating Segments | Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized gain loss on commodity related derivatives | 237 | (324) | (42)
Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 576 | 1,156 | 1,364
Total revenues | 1,831 | 868 | 661
Sunset | Operating Segments | Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized gain loss on commodity related derivatives | 603 | (3) | (394)
Unrealized gain (loss) on derivatives affiliated | 187 | 30 | (144)
Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 611 | 538
Total revenues | 0 | 384 | 78
Asset Closure | Operating Segments | Operating revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Unrealized gain loss on commodity related derivatives | 36 | 106 | (240)
Unrealized gain (loss) on derivatives affiliated |  | 4 | (18)
Retail energy charge in ERCOT |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 7,674 | 6,971 | 5,733
Retail energy charge in ERCOT | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in ERCOT | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 7,674 | 6,971 | 5,733
Retail energy charge in ERCOT | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in ERCOT | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in ERCOT | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in ERCOT | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in ERCOT | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in Northeast/Midwest |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 1,642 | 2,139 | 2,255
Retail energy charge in Northeast/Midwest | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in Northeast/Midwest | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 1,642 | 2,139 | 2,255
Retail energy charge in Northeast/Midwest | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in Northeast/Midwest | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in Northeast/Midwest | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in Northeast/Midwest | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Retail energy charge in Northeast/Midwest | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Wholesale generation revenue from ISO/RTO |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 2,909 | 4,293 | 6,348
Wholesale generation revenue from ISO/RTO | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Wholesale generation revenue from ISO/RTO | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Wholesale generation revenue from ISO/RTO | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 1,060 | 1,105 | 3,808
Wholesale generation revenue from ISO/RTO | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 1,036 | 1,209 | 786
Wholesale generation revenue from ISO/RTO | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 421 | 467 | 229
Wholesale generation revenue from ISO/RTO | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 392 | 950 | 1,050
Wholesale generation revenue from ISO/RTO | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 562 | 475
Capacity revenue from ISO/RTO (a) |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 98 | 103 | 163
Capacity revenue from ISO/RTO (a) | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Capacity revenue from ISO/RTO (a) | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Capacity revenue from ISO/RTO (a) | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Capacity revenue from ISO/RTO (a) | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 57 | 20 | (22)
Net capacity sold | 157 | 302 | (448)
Net capacity purchased | 100 | 282 | 470
Capacity revenue from ISO/RTO (a) | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 1
Net capacity sold |  |  | (1)
Capacity revenue from ISO/RTO (a) | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 41 | 56 | 122
Net capacity sold | 76 | 59 | (126)
Net capacity purchased | 35 | 3 | 4
Capacity revenue from ISO/RTO (a) | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 27 | 62
Net capacity sold |  | 27 | (62)
Revenue from other wholesale contracts |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 1,481 | 2,125 | 3,201
Revenue from other wholesale contracts | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Revenue from other wholesale contracts | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 0 | 0
Revenue from other wholesale contracts | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 505 | 696 | 2,302
Revenue from other wholesale contracts | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 654 | 1,106 | 602
Revenue from other wholesale contracts | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 179 | 151 | 104
Revenue from other wholesale contracts | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 143 | 150 | 192
Revenue from other wholesale contracts | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenue from contracts with customers | 0 | 22 | 1
Total other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 975 | (1,903) | (5,623)
Total other revenues | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | (6,576) | (4,754) | (2,284)
Total other revenues | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,256 | 345 | (117)
Total other revenues | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 2,258 | 1,932 | (3,320)
Total other revenues | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 2,468 | 1,371 | 1,221
Total other revenues | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 314 | (282) | 40
Total other revenues | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,255 | (288) | (703)
Total other revenues | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | (227) | (460)
Intangible amortization |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | (6) | (6) | 60
Intangible amortization | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Intangible amortization | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | (1) | 0 | (2)
Intangible amortization | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Intangible amortization | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | (2) | 1 | 74
Intangible amortization | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Intangible amortization | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | (3) | (7) | (12)
Intangible amortization | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Transferable PTC revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 10 |  |
Transferable PTC revenues | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Transferable PTC revenues | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Transferable PTC revenues | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 10 |  |
Transferable PTC revenues | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Transferable PTC revenues | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Transferable PTC revenues | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Transferable PTC revenues | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 |  |
Hedging and other revenues |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 971 | (1,897) | (5,683)
Hedging and other revenues | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 2 | 1 | 0
Hedging and other revenues | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 1,257 | 345 | (115)
Hedging and other revenues | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | (1,611) | (640) | (4,355)
Hedging and other revenues | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 277 | (316) | 123
Hedging and other revenues | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 310 | (291) | 35
Hedging and other revenues | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 736 | (765) | (929)
Hedging and other revenues | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | (231) | (442)
Affiliate sales |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Affiliate sales | Eliminations |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | (6,578) | (4,755) | (2,284)
Affiliate sales | Retail | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 0 | 0 | 0
Affiliate sales | Texas | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 3,859 | 2,572 | 1,035
Affiliate sales | East | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 2,193 | 1,686 | 1,024
Affiliate sales | West | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 4 | 9 | 5
Affiliate sales | Sunset | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | 522 | 484 | 238
Affiliate sales | Asset Closure | Operating Segments |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Total revenues | $ 0 | $ 4 | $ (18)

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