Commitments and Contingencies - Restricted Assets (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Loss Contingencies [Line Items]
Operating leases, rent expense	$ 30	$ 34	$ 29
Fixed maturity collateral pledged to FHLB	1,211	771
FHLB restricted stock	55	50
Trading securities	48	99
Cash & cash equivalents	12	13
Total restricted assets	2,734	2,395
Securities pledged
Loss Contingencies [Line Items]
Fair value of loaned securities	1,159	1,237
Fair value of securities delivered as collateral	183	180
Securities Loaned
Loss Contingencies [Line Items]
Fair value of securities delivered as collateral	183	180
Line of Credit \| Federal Home Loan Bank Borrowings
Loss Contingencies [Line Items]
Fixed maturity collateral pledged to FHLB	1,211	771
Non-putable funding agreements	877	657
Collateral pledged
Loss Contingencies [Line Items]
Securities pledged	$ 1,408	$ 1,462

Amount of restricted investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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