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SCHEDULE I - PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 3,981 | $ 4,587 | $ 2,262
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Acquisitions, net of cash and cash equivalents acquired | (233) | (337) | (4,187)
Purchases of property and equipment, net | (1,004) | (1,137) | (1,342)
Purchases of investment securities | (7,552) | (6,049) | (7,197)
Proceeds from sale of investment securities | 3,795 | 2,434 | 3,547
Maturities of investment securities | 1,292 | 1,365 | 2,597
Net cash used in investing activities | (3,492) | (1,006) | (6,556)
Cash flows from financing activities: |  |  |
Proceeds from issuance of senior notes, net | 2,544 | 1,982 | 2,984
Repayment of senior notes | (1,832) | (1,000) | 0
Proceeds (repayments) from issuance of commercial paper, net | 211 | (376) | 352
Change in book overdraft | 55 | (28) | 6
Common stock repurchases | (1,573) | (2,096) | (79)
Dividends paid | (431) | (392) | (354)
Net cash (used in) provided by financing activities | (856) | (1,914) | 3,015
(Decrease) increase in cash and cash equivalents | (367) | 1,667 | (1,279)
Cash and cash equivalents at beginning of period | 5,061 | 3,394 | 4,673
Cash and cash equivalents at end of period | 4,694 | 5,061 | 3,394
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 3,042 | 4,868 | 2,853
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Acquisitions, net of cash and cash equivalents acquired | (233) | (337) | (4,187)
Capital contributions to operating subsidiaries | (792) | (484) | (2,580)
Purchases of property and equipment, net | (761) | (931) | (958)
Purchases of investment securities | (17) | (63) | (200)
Proceeds from sale of investment securities | 41 | 468 | 71
Maturities of investment securities | 67 | 30 | 122
Net cash used in investing activities | (1,695) | (1,317) | (7,732)
Cash flows from financing activities: |  |  |
Proceeds from issuance of senior notes, net | 2,537 | 1,976 | 2,953
Repayment of senior notes | (1,832) | (1,000) | 0
Proceeds (repayments) from issuance of commercial paper, net | 211 | (376) | 352
Proceeds from term loan | 0 | 0 | 2,500
Repayment of term loan | (500) | (2,000) | 0
Change in book overdraft | 2 | 5 | (52)
Common stock repurchases | (1,573) | (2,096) | (79)
Dividends paid | (431) | (392) | (354)
Other, net | (125) | 40 | 29
Net cash (used in) provided by financing activities | (1,711) | (3,843) | 5,349
(Decrease) increase in cash and cash equivalents | (364) | (292) | 470
Cash and cash equivalents at beginning of period | 614 | 906 | 436
Cash and cash equivalents at end of period | $ 250 | $ 614 | $ 906

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