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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