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Schedule I - Condensed Financial Information of Parent - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
OPERATING ACTIVITIES:      
Net cash provided by operating activities $ 8,323 $ 7,344 $ 6,554
INVESTING ACTIVITIES:      
Other investing activities 1 3 (15)
Net cash provided by (used in) investing activities 129 1,486 (518)
FINANCING ACTIVITIES:      
Proceeds from the issuance of long-term debt 4,836 1,893 3,621
Payments on maturity and conversion of debt (1,312) (500) (1,880)
Payments for repurchase of common stock 6,509 10,377 6,621
Dividends paid (1,174) 0 0
Proceeds from exercise of stock options 14 134 7
Other financing activities (59) (59) (24)
Net cash used in financing activities (4,204) (8,909) (4,897)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents 4,058 (116) 1,099
Total cash and cash equivalents and restricted cash and cash equivalents, beginning of period 12,135 12,251 11,152
Total cash and cash equivalents and restricted cash and cash equivalents, end of period 16,193 12,135 12,251
Parent Company      
OPERATING ACTIVITIES:      
Net cash provided by operating activities 6,414 6,464 3,695
INVESTING ACTIVITIES:      
Proceeds from internal transfers of subsidiaries 0 0 174
Dividends received 139 107 3,087
Other investing activities (37) (128) (102)
Net cash provided by (used in) investing activities 102 (21) 3,159
FINANCING ACTIVITIES:      
Proceeds from the issuance of long-term debt 4,836 1,893 3,621
Payments on maturity and conversion of debt (1,312) (500) (1,880)
Payments for repurchase of common stock 6,509 10,377 6,621
Dividends paid (1,174) 0 0
Proceeds from exercise of stock options 14 134 7
Other financing activities 50 49 47
Net cash used in financing activities (4,095) (8,801) (4,826)
Net increase (decrease) in cash and cash equivalents and restricted cash and cash equivalents 2,421 (2,358) 2,028
Total cash and cash equivalents and restricted cash and cash equivalents, beginning of period 1,752 4,110 2,082
Total cash and cash equivalents and restricted cash and cash equivalents, end of period $ 4,173 $ 1,752 $ 4,110