Schedule I Condensed Balance Sheets (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 23,365	$ 21,375
Total current assets	69,069	61,758
Other assets	15,027	12,526
Total assets	245,705	212,206	$ 197,289
Current liabilities:
Accounts payable and accrued liabilities	27,715	24,643
Total current liabilities	89,237	78,292
Long-term debt, less current maturities	54,513	42,383
Other liabilities	12,839	11,787
Total liabilities	159,358	135,727
Commitments and contingencies (Note 4)
Shareholders’ equity:
Preferred stock, $0.001 par value - 10 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.01 par value - 3,000 shares authorized; 934 and 941 issued and outstanding	9	10
Retained earnings	86,156	77,134
Accumulated other comprehensive loss	(8,393)	(5,384)
Total liabilities and shareholders’ equity	245,705	212,206
Parent Company [Member]
Current assets:
Cash and cash equivalents	266	2,167	$ 258	$ 46
Other current assets	753	503
Total current assets	1,019	2,670
Equity in net assets of subsidiaries	136,562	116,907
Long-term notes receivable from subsidiaries	6,201	5,680
Other assets	504	32
Total assets	144,286	125,289
Current liabilities:
Accounts payable and accrued liabilities	835	605
Current portion of notes payable to subsidiaries	8,699	8,105
Short-term borrowings and current maturities of long-term debt	2,918	3,009
Total current liabilities	12,452	11,719
Long-term debt, less current maturities	53,838	41,623
Other liabilities	224	187
Total liabilities	66,514	53,529
Shareholders’ equity:
Preferred stock, $0.001 par value - 10 shares authorized; no shares issued or outstanding	0	0
Common stock, $0.01 par value - 3,000 shares authorized; 934 and 941 issued and outstanding	9	10
Retained earnings	86,156	77,134
Accumulated other comprehensive loss	(8,393)	(5,384)
Total UnitedHealth Group shareholders’ equity	77,772	71,760
Total liabilities and shareholders’ equity	$ 144,286	$ 125,289