Investment Securities (Details 2) $ in Millions	Jun. 30, 2021 USD ($) security	Dec. 31, 2020 security
Number of Securities
Less than 12 months | security	6
12 months or more | security	0
Total | security	6	0
Estimated Fair Value
Less than 12 months	$ 26
12 months or more	0
Total	26
Gross Unrealized Losses
Less than 12 months	(1)
12 months or more	0
Total	$ (1)
90%-100%
Number of Securities
Less than 12 months | security	6
12 months or more | security	0
Total | security	6
Estimated Fair Value
Less than 12 months	$ 26
12 months or more	0
Total	26
Gross Unrealized Losses
Less than 12 months	(1)
12 months or more	0
Total	$ (1)
Less than 90%
Number of Securities
Less than 12 months | security	0
12 months or more | security	0
Total | security	0
Estimated Fair Value
Less than 12 months	$ 0
12 months or more	0
Total	0
Gross Unrealized Losses
Less than 12 months	0
12 months or more	0
Total	$ 0