Schedule I Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities
Cash flows from operating activities	$ 26,206	$ 22,343	$ 22,174
Investing activities
Cash paid for acquisitions	(21,458)	(4,821)	(7,139)
Cash received from dispositions	3,414	15	221
Cash flows used for investing activities	(28,476)	(10,372)	(12,532)
Financing activities
Common stock repurchases	(7,000)	(5,000)	(4,250)
Proceeds from common stock issuances	1,253	1,355	1,440
Proceeds from (repayments of) short-term borrowings, net	732	(1,302)	872
Proceeds from issuance of long-term debt	14,819	6,933	4,864
Repayments of long-term debt	(3,015)	(3,150)	(3,150)
Other, net	(1,944)	(295)	(459)
Cash flows from (used for) financing activities	4,226	(7,455)	(3,590)
(Decrease) increase in cash and cash equivalents	1,990	4,454	5,936
Cash and cash equivalents, beginning of period	21,375
Cash and cash equivalents, end of period	23,365	21,375
Supplemental cash flow disclosures
Cash paid for interest	1,945	1,653	1,704
Cash paid for income taxes	5,222	3,966	4,935
Parent Company [Member]
Operating activities
Cash flows from operating activities	14,754	11,439	8,842
Investing activities
Issuances of notes to subsidiaries	(567)	(444)	(628)
Repayments of notes to subsidiaries	281	37	1,089
Cash paid for acquisitions	(20,728)	(4,953)	(7,706)
Return of capital to parent company	1,424	245	943
Capital contributions to subsidiaries	(570)	(747)	(43)
Cash received from dispositions	2,787	0	143
Cash flows used for investing activities	(17,373)	(5,862)	(6,202)
Financing activities
Common stock repurchases	(7,000)	(5,000)	(4,250)
Proceeds from common stock issuances	1,253	1,355	1,440
Cash dividends paid	(5,991)	(5,280)	(4,584)
Proceeds from (repayments of) short-term borrowings, net	732	(1,302)	872
Proceeds from issuance of long-term debt	14,819	6,933	4,864
Repayments of long-term debt	(3,015)	(3,150)	(3,150)
Proceeds from notes from subsidiary	594	3,223	2,818
Other, net	(674)	(447)	(438)
Cash flows from (used for) financing activities	718	(3,668)	(2,428)
(Decrease) increase in cash and cash equivalents	(1,901)	1,909	212
Cash and cash equivalents, beginning of period	2,167	258	46
Cash and cash equivalents, end of period	266	2,167	258
Supplemental cash flow disclosures
Cash paid for interest	1,969	1,575	1,633
Cash paid for income taxes	$ 4,298	$ 3,050	$ 4,185