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Segment Information
 12 Months Ended
Dec. 31, 2022
Segment Reporting [Abstract]  
Segment Information Segment Information
Centene operates in two segments: Managed Care and Specialty Services. The Managed Care segment consists of Centene's health plans, including all of the functions needed to operate them. The Specialty Services segment consists of Centene's specialty companies offering auxiliary healthcare services and products. Factors used in determining the reportable business segments include the nature of operating activities, the existence of separate senior management teams, and the type of information presented to the Company's chief operating decision-maker to evaluate all results of operations.

In early 2023, and in conjunction with the Company's updated strategic plan, executive leadership realignment, and corresponding 2023 divestitures, the Company has revised the way it manages the business, evaluates performance, and allocates resources, resulting in an updated segment structure comprised of (1) a Medicaid segment, (2) a Medicare segment, (3) a Commercial segment and (4) an Other segment. The Company will begin reporting under this new segment structure in 2023.

The Company does not report total assets by segment since this is not a metric used to allocate resources or evaluate segment performance.

As further discussed in Note 3. Acquisitions and Divestitures, as part of the Company's ongoing portfolio review various divestitures were pending or completed during the year ended December 31, 2022. The Spanish and Central European businesses were included in the Managed Care segment. The PANTHERx, Magellan Rx, Magellan Specialty Health, Centurion, and HealthSmart businesses were included in the Specialty Services segment.

Segment information for the year ended December 31, 2022, follows ($ in millions):
 
Managed Care		Specialty ServicesEliminationsConsolidated Total
Total revenues from external customers$135,055 $9,492 $— $144,547 
Total revenues from internal customers8 13,273 (13,281)— 
Total revenues$135,063 $22,765 $(13,281)$144,547 
Earnings (loss) from operations$1,913 $(595)$— $1,318 

Segment information for the year ended December 31, 2021, follows ($ in millions):
 
Managed Care		Specialty ServicesEliminationsConsolidated Total
Total revenues from external customers$120,119 $5,863 $— $125,982 
Total revenues from internal customers6 12,789 (12,795)— 
Total revenues$120,125 $18,652 $(12,795)$125,982 
Earnings (loss) from operations$1,789 $(5)$— $1,784 

Segment information for the year ended December 31, 2020, follows ($ in millions):
 
Managed Care		Specialty ServicesEliminationsConsolidated Total
Total revenues from external customers$106,862 $4,253 $— $111,115 
Total revenues from internal customers5 10,741 (10,746)— 
Total revenues$106,867 $14,994 $(10,746)$111,115 
Earnings from operations$3,031 $51 $— $3,082