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Segments - Reconciliation of Gross Margin to Consolidated Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Add: other operating revenues	$ 5,021	$ 4,243	$ 14,188	$ 12,555
Less: other operating expenses	(4,732)	(3,986)	(13,201)	(11,753)
Operating income	289	257	987	802
Other expenses, net	27	24	77	52
Income before income tax expense	262	233	910	750
Other operating
Segment Reporting Information [Line Items]
Add: other operating revenues	253	159	744	470
Less: other operating expenses	(634)	(463)	(1,789)	(1,393)
Health Plans
Segment Reporting Information [Line Items]
Add: other operating revenues	5,020	4,239	14,181	12,546
Health Plans | Operating segments
Segment Reporting Information [Line Items]
Margin	670	561	2,032	1,725
Other
Segment Reporting Information [Line Items]
Add: other operating revenues	$ 1	$ 4	$ 7	$ 9

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