Equity (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Equity, Class of Treasury Stock [Line Items]
Document Period End Date			Jun. 30, 2021
Treasury Stock, Value, Acquired, Cost Method	$ 1	$ 6	$ 2	$ 162
Stock Repurchase Program, Authorized Amount	$ 400		400
Proceeds from issuance of common stock, net		$ 481	$ 0	$ 481
RGA Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired			1,074,413
Treasury Stock, Value, Acquired, Cost Method			$ 153