Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Equity, Class of Treasury Stock [Line Items]
Stock Issued During Period, Shares, New Issues			6,172,840
Entity Listing, Par Value Per Share			$ 0.01
Shares Issued, Price Per Share	$ 81.00		$ 81.00
Document Period End Date			Sep. 30, 2020
Treasury Stock, Value, Acquired, Cost Method	$ 0	$ 30	$ 162	$ 98
Stock Repurchase Program, Authorized Amount	$ 400		400
Proceeds from Issuance of Common Stock			$ 481	$ 0
Underwriter Option Additional Shares			925,926
RGA Share Repurchase Program [Member]
Equity, Class of Treasury Stock [Line Items]
Treasury Stock, Shares, Acquired			1,074,413	546,614
Treasury Stock, Value, Acquired, Cost Method			$ 153	$ 80