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Schedule I Statement of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Operating activities      
Cash flows from operating activities $ 24,204 $ 29,068 $ 26,206
Investing activities      
Cash paid for acquisitions and other transactions (13,408) (10,136) (21,458)
Cash received from dispositions and other strategic transactions, net 2,041 685 3,414
Other, net 1,667 960 793
Cash flows used for investing activities (20,527) (15,574) (28,476)
Financing activities      
Common stock repurchases (9,000) (8,000) (7,000)
Proceeds from common stock issuances 1,846 1,353 1,253
(Repayments of) proceeds from short-term borrowings, net (151) 11 732
Proceeds from issuance of long-term debt 17,811 6,394 14,819
Repayments of long-term debt (3,000) (2,125) (3,015)
Other, net (1,645) (1,150) (1,944)
Cash flows from (used for) financing activities (3,512) (11,529) 4,226
(Decrease) increase in cash and cash equivalents (115) 2,062 1,990
Cash and cash equivalents, beginning of period 25,427    
Cash and cash equivalents, end of period 25,312 25,427  
Supplemental cash flow disclosures      
Cash paid for interest 3,594 3,035 1,945
Cash paid for income taxes 4,620 6,078 5,222
Parent Company [Member]      
Operating activities      
Cash flows from operating activities 4,852 17,443 14,754
Investing activities      
Issuances of notes to subsidiaries (349) (41) (567)
Repayments of notes to subsidiaries 225 817 281
Cash paid for acquisitions and other transactions (13,750) (8,144) (20,728)
Return of capital to parent company 21 639 1,424
Capital contributions to subsidiaries 0 (2,472) (570)
Cash received from dispositions and other strategic transactions, net 2,444 624 2,787
Other, net 30 286 0
Cash flows used for investing activities (11,379) (8,291) (17,373)
Financing activities      
Common stock repurchases (9,000) (8,000) (7,000)
Proceeds from common stock issuances 1,846 1,353 1,253
Cash dividends paid (7,533) (6,761) (5,991)
(Repayments of) proceeds from short-term borrowings, net (151) 11 732
Proceeds from issuance of long-term debt 17,811 6,394 14,819
Repayments of long-term debt (3,000) (2,125) (3,015)
(Repayments of) proceeds from notes from short-term notes from subsidiaries, net (7,966) 1,188 594
Proceeds from long-term notes from subsidiaries 14,396 0 0
Repayments of long-term notes from subsidiaries (28) 0 0
Other, net (390) (702) (674)
Cash flows from (used for) financing activities 5,985 (8,642) 718
(Decrease) increase in cash and cash equivalents (542) 510 (1,901)
Cash and cash equivalents, beginning of period 776 266 2,167
Cash and cash equivalents, end of period 234 776 266
Supplemental cash flow disclosures      
Cash paid for interest 4,241 3,257 1,969
Cash paid for income taxes $ 2,450 $ 4,426 $ 4,298