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Schedule I Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Operating activities |  |  |
Cash flows from operating activities | $ 22,343 | $ 22,174 | $ 18,463
Investing activities |  |  |
Cash paid for acquisitions | (4,821) | (7,139) | (8,343)
Other, net | 1,254 | 506 | (219)
Cash flows used for investing activities | (10,372) | (12,532) | (12,699)
Financing activities |  |  |
Common stock repurchases | (5,000) | (4,250) | (5,500)
Proceeds from common stock issuances | 1,355 | 1,440 | 1,037
(Repayments of) proceeds from commercial paper, net | (1,302) | 872 | 300
Proceeds from issuance of long-term debt | 6,933 | 4,864 | 5,444
Repayments of long-term debt | (3,150) | (3,150) | (1,750)
Other, net | (295) | (459) | (619)
Cash flows used for financing activities | (7,455) | (3,590) | (5,625)
Cash and cash equivalents, beginning of period | 16,921 | 10,985 | 10,866
Cash and cash equivalents, end of period | 21,375 | 16,921 | 10,985
Supplemental cash flow disclosures |  |  |
Cash paid for interest | 1,653 | 1,704 | 1,627
Cash paid for income taxes | 3,966 | 4,935 | 3,542
Parent Company [Member] |  |  |
Operating activities |  |  |
Cash flows from operating activities | 11,439 | 8,842 | 9,275
Investing activities |  |  |
Issuances of notes to subsidiaries | (444) | (628) | (2,722)
Repayments of notes to subsidiaries | 37 | 1,089 | 2,249
Cash paid for acquisitions | (4,953) | (7,706) | (9,645)
Return of capital to parent company | 245 | 943 | 4,497
Capital contributions to subsidiaries | (747) | (43) | (803)
Other, net | 0 | 143 | 490
Cash flows used for investing activities | (5,862) | (6,202) | (5,934)
Financing activities |  |  |
Common stock repurchases | (5,000) | (4,250) | (5,500)
Proceeds from common stock issuances | 1,355 | 1,440 | 1,037
Cash dividends paid | (5,280) | (4,584) | (3,932)
(Repayments of) proceeds from commercial paper, net | (1,302) | 872 | 300
Proceeds from issuance of long-term debt | 6,933 | 4,864 | 5,444
Repayments of long-term debt | (3,150) | (3,150) | (1,750)
Proceeds from notes from subsidiary | 3,223 | 2,818 | 1,207
Other, net | (447) | (438) | (535)
Cash flows used for financing activities | (3,668) | (2,428) | (3,729)
Increase (decrease) in cash and cash equivalents | 1,909 | 212 | (388)
Cash and cash equivalents, beginning of period | 258 | 46 | 434
Cash and cash equivalents, end of period | 2,167 | 258 | 46
Supplemental cash flow disclosures |  |  |
Cash paid for interest | 1,575 | 1,633 | 1,506
Cash paid for income taxes | $ 3,050 | $ 4,185 | $ 2,590

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