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Condensed Financial Information of Registrant - Condensed Statements of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash flows from operating activities:      
Other operating activities, net $ 2 $ 1 $ 25
Net cash provided by operating activities 6,261 4,205 5,503
Cash flows from investing activities:      
Purchases of investments (6,736) (7,400) (7,402)
Sales and maturities of investments 3,802 5,458 4,921
Other investing activities, net 0 19 (22)
Net cash (used in) investing activities (2,921) (3,299) (6,955)
Cash flows from financing activities:      
Proceeds from common stock issuances 70 35 28
Proceeds from long-term debt 360 9,267 5,107
Payments and repurchases of long-term debt (1,490) (7,434) (4,067)
Common stock repurchases (3,096) (297) (626)
Payments for debt extinguishment (14) (157) (81)
Debt issuance costs 0 (72) (120)
Other financing activities, net (27) 20 19
Net cash (used in) provided by financing activities (4,197) 1,362 260
Cash, cash equivalents, and restricted cash and cash equivalents, beginning of period 13,214 10,957 12,131
Cash, cash equivalents, and restricted cash and cash equivalents, end of period 12,330 13,214 10,957
Parent Company      
Cash flows from operating activities:      
Dividends from subsidiaries, return on investment 1,706 2,194 739
Payments for legal settlement (282) (298) 0
Other operating activities, net (450) (582) (287)
Net cash provided by operating activities 974 1,314 452
Cash flows from investing activities:      
Capital contributions to subsidiaries (880) (1,217) (761)
Purchases of investments (2) (723) (111)
Sales and maturities of investments 0 66 11
Dividends from subsidiaries, return of investment 10 241 87
Investments in acquisitions (2,431) (151) (7,188)
Proceeds from divestitures 0 130 533
Intercompany activities 5,785 (1,709) 1,185
Other investing activities, net 3 0 (12)
Net cash (used in) investing activities 2,485 (3,363) (6,256)
Cash flows from financing activities:      
Proceeds from common stock issuances 70 35 28
Proceeds from long-term debt 75 9,066 4,870
Payments and repurchases of long-term debt (491) (7,207) (3,875)
Common stock repurchases (3,096) (297) (626)
Payments for debt extinguishment (14) (157) (81)
Debt issuance costs 0 (72) (120)
Other financing activities, net 0 22 19
Net cash (used in) provided by financing activities (3,456) 1,390 215
Net increase (decrease) in cash and cash equivalents 3 (659) (5,589)
Cash, cash equivalents, and restricted cash and cash equivalents, beginning of period 9 668 6,257
Cash, cash equivalents, and restricted cash and cash equivalents, end of period $ 12 $ 9 $ 668