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SCHEDULE I - PARENT COMPANY FINANCIAL INFORMATION (Condensed Statements of Cash Flows) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | $ 4,587 | $ 2,262 | $ 5,639
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Acquisitions, net of cash and cash equivalents acquired | (337) | (4,187) | (709)
Purchases of investment securities | (6,049) | (7,197) | (9,125)
Proceeds from sale of investment securities | 2,434 | 3,547 | 2,747
Maturities of investment securities | 1,365 | 2,597 | 4,986
Purchases of property and equipment, net | (1,120) | (1,316) | (964)
Net cash used in investing activities | (1,006) | (6,556) | (3,065)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Proceeds from issuance of senior notes, net | 1,982 | 2,984 | 1,088
Debt issue costs | (6) | (31) | 0
Repayment of senior notes | (1,000) | 0 | (400)
(Repayments) proceeds from issuance of commercial paper, net | (376) | 352 | 295
Proceeds from term loan | 0 | 2,500 | 1,000
Repayment of term loan | (2,000) | (2,078) | (1,000)
Change in book overdraft | (28) | 6 | 95
Common stock repurchases | (2,096) | (79) | (1,820)
Dividends paid | (392) | (354) | (323)
Net cash (used in) provided by financing activities | (1,914) | 3,015 | (1,955)
Increase (decrease) in cash and cash equivalents | 1,667 | (1,279) | 619
Cash and cash equivalents at beginning of period | 3,394 | 4,673 | 4,054
Cash and cash equivalents at end of period | 5,061 | 3,394 | 4,673
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net cash provided by operating activities | 4,868 | 2,853 | 2,531
Net Cash Provided by (Used in) Investing Activities [Abstract] |  |  |
Acquisitions, net of cash and cash equivalents acquired | (337) | (4,187) | (709)
Capital contributions to operating subsidiaries | (484) | (2,580) | (538)
Purchases of investment securities | (63) | (200) | (460)
Proceeds from sale of investment securities | 468 | 71 | 13
Maturities of investment securities | 30 | 122 | 411
Purchases of property and equipment, net | (931) | (958) | (785)
Net cash used in investing activities | (1,317) | (7,732) | (2,068)
Net Cash Provided by (Used in) Financing Activities [Abstract] |  |  |
Proceeds from issuance of senior notes, net | 1,976 | 2,953 | 1,088
Repayment of senior notes | (1,000) | 0 | (400)
(Repayments) proceeds from issuance of commercial paper, net | (376) | 352 | 295
Proceeds from term loan | 0 | 2,500 | 1,000
Repayment of term loan | (2,000) | 0 | (1,000)
Change in book overdraft | 5 | (52) | 80
Common stock repurchases | (2,096) | (79) | (1,820)
Dividends paid | (392) | (354) | (323)
Other, net | 40 | 29 | 47
Net cash (used in) provided by financing activities | (3,843) | 5,349 | (1,033)
Increase (decrease) in cash and cash equivalents | (292) | 470 | (570)
Cash and cash equivalents at beginning of period | 906 | 436 | 1,006
Cash and cash equivalents at end of period | $ 614 | $ 906 | $ 436

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- Definition Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage. Excludes amount for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3521-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3044-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=126999549&loc=SL98516268-108586 + Details
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