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Investments - Amortized Cost, Gross Unrealized Gains and Losses, Fair Values of Investments (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Securities
Amortized Cost	$ 560	$ 444
Gross Unrealized Gains	5	7
Gross Unrealized Losses	0	0
Fair Value	565	451
Asset-backed securities
Debt Securities
Amortized Cost	44	24
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	44	24
Corporate bonds
Debt Securities
Amortized Cost	167	126
Gross Unrealized Gains	2	2
Gross Unrealized Losses	0	0
Fair Value	169	128
U.S. government agencies and government- sponsored agencies
Debt Securities
Amortized Cost	19	27
Gross Unrealized Gains	0	1
Gross Unrealized Losses	0	0
Fair Value	19	28
U.S. treasuries
Debt Securities
Amortized Cost	312	261
Gross Unrealized Gains	3	4
Gross Unrealized Losses	0	0
Fair Value	315	265
Certificate of deposits
Debt Securities
Amortized Cost	10	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	10	0
Other debt securities
Debt Securities
Amortized Cost	8	6
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 8	$ 6

X

- Definition

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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