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Schedule I Statement of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Operating activities      
Cash flows from operating activities $ 29,068 $ 26,206 $ 22,343
Investing activities      
Cash paid for acquisitions (10,136) (21,458) (4,821)
Cash received from dispositions 685 3,414 15
Other, net 960 793 1,269
Cash flows used for investing activities (15,574) (28,476) (10,372)
Financing activities      
Common stock repurchases (8,000) (7,000) (5,000)
Proceeds from common stock issuances 1,353 1,253 1,355
Proceeds from (repayments of) short-term borrowings, net 11 732 (1,302)
Proceeds from issuance of long-term debt 6,394 14,819 6,933
Repayments of long-term debt (2,125) (3,015) (3,150)
Other, net (1,150) (1,944) (295)
Cash flows from (used for) financing activities (11,529) 4,226 (7,455)
Increase (decrease) in cash and cash equivalents 2,062 1,990 4,454
Cash and cash equivalents, beginning of period 23,365    
Cash and cash equivalents, end of period 25,427 23,365  
Supplemental cash flow disclosures      
Cash paid for interest 3,035 1,945 1,653
Cash paid for income taxes 6,078 5,222 3,966
Parent Company [Member]      
Operating activities      
Cash flows from operating activities 17,443 14,754 11,439
Investing activities      
Issuances of notes to subsidiaries (41) (567) (444)
Repayments of notes to subsidiaries 817 281 37
Cash paid for acquisitions (8,144) (20,728) (4,953)
Return of capital to parent company 639 1,424 245
Capital contributions to subsidiaries (2,472) (570) (747)
Cash received from dispositions 624 2,787 0
Other, net 286 0 0
Cash flows used for investing activities (8,291) (17,373) (5,862)
Financing activities      
Common stock repurchases (8,000) (7,000) (5,000)
Proceeds from common stock issuances 1,353 1,253 1,355
Cash dividends paid (6,761) (5,991) (5,280)
Proceeds from (repayments of) short-term borrowings, net 11 732 (1,302)
Proceeds from issuance of long-term debt 6,394 14,819 6,933
Repayments of long-term debt (2,125) (3,015) (3,150)
Proceeds from notes from subsidiary 1,188 594 3,223
Other, net (702) (674) (447)
Cash flows from (used for) financing activities (8,642) 718 (3,668)
Increase (decrease) in cash and cash equivalents 510 (1,901) 1,909
Cash and cash equivalents, beginning of period 266 2,167 258
Cash and cash equivalents, end of period 776 266 2,167
Supplemental cash flow disclosures      
Cash paid for interest 3,257 1,969 1,575
Cash paid for income taxes $ 4,426 $ 4,298 $ 3,050