Derivative Instruments (Cumulative Basis Adjustments For Fair Value Hedges) (Details) $ in Millions	Jun. 30, 2019 USD ($)
Fixed Maturity AFS Securities [Member]
Derivatives, Fair Value [Line Items]
Amortized cost of hedged assets	$ 772
Cumulative amount of fair value hedging adjustment included in the amortized cost of the hedged assets	196
Long-term Debt [Member]
Derivatives, Fair Value [Line Items]
Amortized cost of hedged liabilities	(1,024)	[1]
Cumulative amount of fair value hedging adjustment included in the amortized cost of the hedged liabilities	(149)	[1]
Discontinued Hedges [Member]
Derivatives, Fair Value [Line Items]
Cumulative amount of fair value hedging adjustment included in the amortized cost of the hedged assets	$ (120)

[1] The balance includes $(120) million of unamortized adjustments from discontinued hedges as of June 30, 2019.