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Investments - Summary of Investments (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 2,030	$ 1,941
Gross Unrealized Gains	10	7
Gross Unrealized Losses	30	2
Estimated Fair Value	2,010	1,946
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,277	1,174
Gross Unrealized Gains	4	5
Gross Unrealized Losses	21	1
Estimated Fair Value	1,260	1,178
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	453	420
Gross Unrealized Gains	6	1
Gross Unrealized Losses	8	1
Estimated Fair Value	451	420
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	144	126
Gross Unrealized Gains	0	1
Gross Unrealized Losses	1	0
Estimated Fair Value	143	127
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	138	78
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	138	78
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	7	1
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	7	1
GSEs
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	6	49
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	6	49
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5	86
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 5	86
Foreign securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		7
Gross Unrealized Gains		0
Gross Unrealized Losses		0
Estimated Fair Value		$ 7

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