Accounting Policies and Supplemental Disclosures - Acquisition Activity (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended		12 Months Ended
	Feb. 22, 2023	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Business Acquisition [Line Items]
Cash consideration		$ 316	$ 259	$ 3,829	$ 6,600	$ 5,545	$ 7,635
Goodwill		$ 22,785		$ 22,785		$ 22,785		$ 20,288
1Life Healthcare
Business Acquisition [Line Items]
Cash consideration	$ 3,500
Intangible assets	1,300
Goodwill	$ 2,500