Equity (Narrative) (Details) - USD ($) $ in Thousands, shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired				1.8
Treasury Stock, Value, Acquired, Cost Method	$ (30,487)	$ (108,804)	$ (98,231)	$ (273,873)
Stock Repurchase Program, Authorized Amount	$ 400,000		$ 400,000
RGA Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired			0.5
Treasury Stock, Value, Acquired, Cost Method			$ 79,800	$ 258,500