DAC, VOBA, DSI and DFEL	12 Months Ended
	Dec. 31, 2021
DAC, VOBA, DSI and DFEL [Abstract]
DAC, VOBA, DSI and DFEL	7. DAC, VOBA, DSI and DFEL Changes in DAC (in millions) were as follows: For the Years Ended December 31, 2021 2020 2019 Balance as of beginning-of-year$ 5,565 $ 7,352 $ 9,448 Cumulative effect from adoption of new accounting standard - 5 - Business acquired (sold) through reinsurance (362) (10) - Deferrals 1,373 1,446 1,902 Amortization, net of interest: Amortization, excluding unlocking, net of interest (1,001) (796) (950)Unlocking (565) (231) (489)Adjustment related to realized (gains) losses 86 (19) 54 Adjustment related to unrealized (gains) losses 792 (2,182) (2,613)Balance as of end-of-year$ 5,888 $ 5,565 $ 7,352 Changes in VOBA (in millions) were as follows: For the Years Ended December 31, 2021 2020 2019 Balance as of beginning-of-year$ 247 $ 342 $ 816 Business acquired (sold) through reinsurance (288) - - Deferrals - 3 6 Amortization: Amortization, excluding unlocking (94) (105) (114)Unlocking (7) (205) 140 Accretion of interest (1) 33 44 45 Adjustment related to realized (gains) losses (3) - (1)Adjustment related to unrealized (gains) losses 305 168 (550)Balance as of end-of-year$ 193 $ 247 $ 342 (1)The interest accrual rates utilized to calculate the accretion of interest ranged from 4.2% to 6.9%. Estimated future amortization of VOBA, net of interest (in millions), as of December 31, 2021, was as follows: 2022$ 45 2023 44 2024 42 2025 40 2026 37 Changes in DSI (in millions) were as follows: For the Years Ended December 31, 2021 2020 2019 Balance as of beginning-of-year$ 213 $ 234 $ 248 Deferrals 5 7 26 Amortization, net of interest: Amortization, excluding unlocking, net of interest (26) (20) (29)Unlocking - (1) (3)Adjustment related to realized (gains) losses 3 (1) 2 Adjustment related to unrealized (gains) losses 8 (6) (10)Balance as of end-of-year$ 203 $ 213 $ 234 Changes in DFEL (in millions) were as follows: For the Years Ended December 31, 2021 2020 2019 Balance as of beginning-of-year$ 401 $ 650 $ 2,769 Cumulative effect from adoption of new accounting standard - 4 - Business acquired (sold) through reinsurance (290) - - Deferrals 1,015 1,003 1,095 Amortization, net of interest: Amortization, excluding unlocking, net of interest (595) (538) (544)Unlocking (387) (275) (426)Adjustment related to realized (gains) losses (10) 25 - Adjustment related to unrealized (gains) losses 281 (468) (2,244)Balance as of end-of-year$ 415 $ 401 $ 650