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Investments - Schedule of Investments (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 1,826	$ 1,941
Gross Unrealized Gains	50	7
Gross Unrealized Losses	1	2
Estimated Fair Value	1,875	1,946
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,220	1,174
Gross Unrealized Gains	36	5
Gross Unrealized Losses	0	1
Estimated Fair Value	1,256	1,178
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	383	420
Gross Unrealized Gains	10	1
Gross Unrealized Losses	1	1
Estimated Fair Value	392	420
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	130	126
Gross Unrealized Gains	2	1
Gross Unrealized Losses	0	0
Estimated Fair Value	132	127
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	66	78
Gross Unrealized Gains	2	0
Gross Unrealized Losses	0	0
Estimated Fair Value	68	78
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27	86
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 27	86
GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		49
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		49
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		1
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		1
Other
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		7
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		$ 7

X

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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