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Schedule I Statement of Cash Flows (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating activities
Cash flows from operating activities	$ 22,343	$ 22,174	$ 18,463
Investing activities
Cash paid for acquisitions	(4,821)	(7,139)	(8,343)
Other, net	1,254	506	(219)
Cash flows used for investing activities	(10,372)	(12,532)	(12,699)
Financing activities
Common stock repurchases	(5,000)	(4,250)	(5,500)
Proceeds from common stock issuances	1,355	1,440	1,037
(Repayments of) proceeds from commercial paper, net	(1,302)	872	300
Proceeds from issuance of long-term debt	6,933	4,864	5,444
Repayments of long-term debt	(3,150)	(3,150)	(1,750)
Other, net	(295)	(459)	(619)
Cash flows used for financing activities	(7,455)	(3,590)	(5,625)
Cash and cash equivalents, beginning of period	16,921	10,985	10,866
Cash and cash equivalents, end of period	21,375	16,921	10,985
Supplemental cash flow disclosures
Cash paid for interest	1,653	1,704	1,627
Cash paid for income taxes	3,966	4,935	3,542
Parent Company [Member]
Operating activities
Cash flows from operating activities	11,439	8,842	9,275
Investing activities
Issuances of notes to subsidiaries	(444)	(628)	(2,722)
Repayments of notes to subsidiaries	37	1,089	2,249
Cash paid for acquisitions	(4,953)	(7,706)	(9,645)
Return of capital to parent company	245	943	4,497
Capital contributions to subsidiaries	(747)	(43)	(803)
Other, net	0	143	490
Cash flows used for investing activities	(5,862)	(6,202)	(5,934)
Financing activities
Common stock repurchases	(5,000)	(4,250)	(5,500)
Proceeds from common stock issuances	1,355	1,440	1,037
Cash dividends paid	(5,280)	(4,584)	(3,932)
(Repayments of) proceeds from commercial paper, net	(1,302)	872	300
Proceeds from issuance of long-term debt	6,933	4,864	5,444
Repayments of long-term debt	(3,150)	(3,150)	(1,750)
Proceeds from notes from subsidiary	3,223	2,818	1,207
Other, net	(447)	(438)	(535)
Cash flows used for financing activities	(3,668)	(2,428)	(3,729)
Increase (decrease) in cash and cash equivalents	1,909	212	(388)
Cash and cash equivalents, beginning of period	258	46	434
Cash and cash equivalents, end of period	2,167	258	46
Supplemental cash flow disclosures
Cash paid for interest	1,575	1,633	1,506
Cash paid for income taxes	$ 3,050	$ 4,185	$ 2,590

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