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Guaranteed Benefit Features	12 Months Ended
Guaranteed Benefit Features	Dec. 31, 2018
Insurance [Abstract]
Guaranteed Benefit Features	Guaranteed Benefit Features The Company calculates an additional liability for certain GMDBs and other minimum guarantees in order to recognize the expected value of these benefits in excess of the projected account balance over the accumulation period based on total expected assessments. The Company regularly evaluates estimates used to adjust the additional liability balance, with a related charge or credit to benefit expense, if actual experience or other evidence suggests that earlier assumptions should be revised. As of December 31, 2018, the account value for the separate account contracts with guaranteed minimum benefits was $37.9 billion. The additional liability recognized related to minimum guarantees was $11. As of December 31, 2017, the account value for the separate account contracts with guaranteed minimum benefits was $38.1 billion. The additional liability recognized related to minimum guarantees was $103. The aggregate fair value of fixed income securities and equity securities, including mutual funds, supporting separate accounts with additional insurance benefits and minimum investment return guarantees as of December 31, 2018 and 2017 was $8.6 billion for both periods.