Condensed Financial Information (Parent Company) Condensed Financial Information (Parent Company) (Condensed Balance Sheets - Phantom) (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Amortized cost of fixed maturity securities available-for-sale	$ 63,083	$ 59,672
Mortgage loans valuation allowances	$ 64	$ 56
Common Stock, Par or Stated Value Per Share	$ 25,000	$ 25,000
Common Stock, Shares Authorized	4,000	4,000
Common Stock, Shares, Issued	3,000	3,000
Common Stock, Shares, Outstanding	3,000	3,000
Parent Company
Condensed Financial Statements, Captions [Line Items]
Amortized cost of fixed maturity securities available-for-sale	$ 53,793	$ 51,281
Mortgage loans valuation allowances	$ 61	$ 55
Common Stock, Par or Stated Value Per Share	$ 25,000	$ 25,000
Common Stock, Shares Authorized	4,000	4,000
Common Stock, Shares, Issued	3,000	3,000
Common Stock, Shares, Outstanding	3,000	3,000