Employee Benefit Arrangements - Defined Contribution Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Company match, percentage	6.00%
Award vesting percentage each year	25.00%
Cost recognized for defined contribution pension plans	$ 37	$ 35	$ 35
Matching contributions, graded vesting schedule, period	4 years