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Schedule I - Condensed Financial Information of Registrant (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash flows — operating activities: |  |  |
Cash used in operating activities | $ 5,453 | $ 485 | $ (206)
Cash flows — investing activities: |  |  |
Capital expenditures | (1,676) | (1,301) | (1,033)
Cash used in investing activities | (2,145) | (1,239) | (1,153)
Cash flows — financing activities: |  |  |
Issuances of preferred stock | 0 | 0 | 2,000
Stock repurchases | (1,245) | (1,949) | (471)
Dividends paid to common stockholders | (313) | (302) | (290)
Dividends paid to preferred stockholders | (150) | (151) | 0
Other, net | 83 | 31 | (21)
Cash provided by (used in) financing activities | (294) | (80) | 2,274
Cash, cash equivalents and restricted cash — beginning balance | 525 | 1,359 | 444
Cash, cash equivalents and restricted cash — ending balance | 3,539 | 525 | 1,359
Parent |  |  |
Cash flows — operating activities: |  |  |
Cash used in operating activities | (31) | (27) | (38)
Cash flows — investing activities: |  |  |
Capital expenditures | 0 | 0 | 0
Dividend received from subsidiaries | 1,625 | 1,775 | 405
Equity contribution to subsidiaries | 0 | 0 | (988)
Cash used in investing activities | 1,625 | 1,775 | (583)
Cash flows — financing activities: |  |  |
Issuances of preferred stock | 0 | 0 | 2,000
Stock repurchases | (1,245) | (1,949) | (471)
Dividends paid to common stockholders | (313) | (302) | (290)
Dividends paid to preferred stockholders | (150) | (151) | 0
Other, net | 91 | 40 | (23)
Cash provided by (used in) financing activities | (1,617) | (2,362) | 1,216
Net change in cash, cash equivalents and restricted cash | (23) | (614) | 595
Cash, cash equivalents and restricted cash — beginning balance | 54 | 668 | 73
Cash, cash equivalents and restricted cash — ending balance | $ 31 | $ 54 | $ 668

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