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Schedule I Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating activities |  |  |
Cash flows from operating activities | $ 22,174 | $ 18,463 | $ 15,713
Investing activities |  |  |
Cash paid for acquisitions | (7,139) | (8,343) | (5,997)
Other, net | 506 | (219) | 226
Cash flows used for investing activities | (12,532) | (12,699) | (12,385)
Financing activities |  |  |
Common stock repurchases | (4,250) | (5,500) | (4,500)
Proceeds from common stock issuances | 1,440 | 1,037 | 838
Proceeds from (repayments of) short-term borrowings, net | 872 | 300 | (201)
Proceeds from issuance of long-term debt | 4,864 | 5,444 | 6,935
Repayments of long-term debt | (3,150) | (1,750) | (2,600)
Other, net | (459) | (1,237) | (1,386)
Cash flows used for financing activities | (3,590) | (5,625) | (4,365)
Cash and cash equivalents, beginning of period | 10,985 | 10,866 | 11,981
Cash and cash equivalents, end of period | 16,921 | 10,985 | 10,866
Supplemental cash flow disclosures |  |  |
Cash paid for interest | 1,704 | 1,627 | 1,410
Cash paid for income taxes | 4,935 | 3,542 | 3,257
Parent Company [Member] |  |  |
Operating activities |  |  |
Cash flows from operating activities | 8,842 | 9,275 | 6,099
Investing activities |  |  |
Issuances of notes to subsidiaries | (628) | (2,722) | (1,420)
Repayments of notes to subsidiaries | 1,089 | 2,249 | 1,419
Cash paid for acquisitions | (7,706) | (9,645) | (4,066)
Return of capital to parent company | 943 | 4,497 | 4,196
Capital contributions to subsidiaries | (43) | (803) | (1,259)
Other, net | 143 | 490 | 4
Cash flows used for investing activities | (6,202) | (5,934) | (1,126)
Financing activities |  |  |
Common stock repurchases | (4,250) | (5,500) | (4,500)
Proceeds from common stock issuances | 1,440 | 1,037 | 838
Cash dividends paid | (4,584) | (3,932) | (3,320)
Proceeds from (repayments of) short-term borrowings, net | 872 | 300 | (201)
Proceeds from issuance of long-term debt | 4,864 | 5,444 | 6,935
Repayments of long-term debt | (3,150) | (1,750) | (2,600)
Proceeds (repayments) of notes from subsidiary | 2,818 | 1,207 | (1,127)
Other, net | (438) | (535) | (923)
Cash flows used for financing activities | (2,428) | (3,729) | (4,898)
Increase (decrease) in cash and cash equivalents | 212 | (388) | 75
Cash and cash equivalents, beginning of period | 46 | 434 | 359
Cash and cash equivalents, end of period | 258 | 46 | 434
Supplemental cash flow disclosures |  |  |
Cash paid for interest | 1,633 | 1,506 | 1,294
Cash paid for income taxes | $ 4,185 | $ 2,590 | $ 2,379

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