CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Operating activities:
Net income	$ 178	$ 198
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	20	25
Deferred income taxes	14	15
Share-based compensation	12	9
Gain on debt repayment	0	(3)
Other, net	(3)	6
Changes in operating assets and liabilities:
Receivables	(197)	(29)
Prepaid expenses and other current assets	(229)	20
Medical claims and benefits payable	127	34
Amounts due government agencies	113	(35)
Accounts payable, accrued liabilities and other	247	(30)
Deferred revenue	(206)	(4)
Income taxes	60	43
Net cash provided by operating activities	136	249
Investing activities:
Purchases of investments	(578)	(185)
Proceeds from sales and maturities of investments	493	366
Purchases of property, equipment and capitalized software	(21)	(6)
Other, net	3	(4)
Net cash (used in) provided by investing activities	(103)	171
Financing activities:
Common stock purchases	(453)	0
Proceeds from borrowings under term loan facility	380	100
Cash paid for partial termination of warrants	(30)	(103)
Cash paid for partial settlement of conversion option	(27)	(115)
Cash received for partial settlement of call option	27	115
Repayment of principal amount of convertible senior notes	(12)	(46)
Other, net	(3)	1
Net cash used in financing activities	(118)	(48)
Net (decrease) increase in cash, cash equivalents, and restricted cash and cash equivalents	(85)	372
Cash, cash equivalents, and restricted cash and cash equivalents at beginning of period	2,508	2,926
Cash, cash equivalents, and restricted cash and cash equivalents at end of period	2,423	3,298
Schedule of non-cash investing and financing activities:
Common stock used for share-based compensation	(7)	(7)
Details of change in fair value of derivatives, net:
Change in fair value of derivatives, net	0	0
1.125% Call Option
Details of change in fair value of derivatives, net:
Change in fair value of derivatives, net	(2)	155
1.125% Conversion Option
Details of change in fair value of derivatives, net:
Change in fair value of derivatives, net	$ 2	$ (155)

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