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Fair Value of Financial Instruments - Changes to Fair Value of Financial Instruments Level 3 (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2018
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | $ 3,467 | $ 15 | $ 3,267 | $ 138 |
F&G Acquisition |  | 2,754 |  | 2,754 |
Assets, Total Gains (Losses) Included in Earnings | 4 | 0 | 14 | (64) |
Assets, Total Gains (Losses) Included in AOCI | 30 | 22 | (30) | 22 |
Assets, Purchases | 1,138 | 92 | 1,542 | 92 |
Assets, Sales | (8) | 0 | (8) | 0 |
Assets, Settlements | (205) | (23) | (345) | (23) |
Assets, Net transfer In (Out) of Level 3 | (26) | 60 | (40) | 1 |
Balance at End of Period | 4,400 | 2,920 | 4,400 | 2,920 |
Change in Unrealized Gains (Losses) Incl in OCI | 33 | 25 | 82 | 25 |
Liabilities |  |  |  |  |
Balance at Beginning of Period | 3,297 | 0 | 3,409 | 0 |
F&G Acquisition |  | 2,857 |  | 2,857 |
Liabilities, Total Gains (Losses) Included in Earnings | 466 | 100 | 355 | 100 |
Liabilities, Total Gains (Losses) Included in AOCI | 0 | 0 | 0 | 0 |
Liabilities, Purchases | 0 | 0 | 0 | 0 |
Liabilities, Sales | (4) | 0 | (4) | 0 |
Liabilities, Settlements | 0 | 0 | (1) | 0 |
Liabilities, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 3,759 | 2,957 | 3,759 | 2,957 |
Change in Unrealized Gains (Losses) Incl in OCI | 0 | 0 | 0 | 0 |
Future policy benefits |  |  |  |  |
Liabilities |  |  |  |  |
Balance at Beginning of Period | 4 | 0 |  | 0 |
F&G Acquisition |  | 5 |  | 5 |
Liabilities, Total Gains (Losses) Included in Earnings | 0 | 0 |  | 0 |
Liabilities, Total Gains (Losses) Included in AOCI | 0 | 0 |  | 0 |
Liabilities, Purchases | 0 | 0 |  | 0 |
Liabilities, Sales | 4 | 0 |  | 0 |
Liabilities, Settlements | 0 | 0 |  | 0 |
Liabilities, Net transfer In (Out) of Level 3 | 0 | 0 |  | 0 |
Balance at End of Period | 0 | 5 | 0 | 5 |
Change in Unrealized Gains (Losses) Incl in OCI | 0 | 0 |  | 0 |
FIA embedded derivatives, included in contractholder funds |  |  |  |  |
Liabilities |  |  |  |  |
Balance at Beginning of Period | 3,293 | 0 | 3,404 | 0 |
F&G Acquisition |  | 2,852 |  | 2,852 |
Liabilities, Total Gains (Losses) Included in Earnings | 466 | 100 | 355 | 100 |
Liabilities, Total Gains (Losses) Included in AOCI | 0 | 0 | 0 | 0 |
Liabilities, Purchases | 0 | 0 | 0 | 0 |
Liabilities, Sales | 0 | 0 | 0 | 0 |
Liabilities, Settlements | 0 | 0 | 0 | 0 |
Liabilities, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 3,759 | 2,952 | 3,759 | 2,952 |
Change in Unrealized Gains (Losses) Incl in OCI |  | 0 | 0 | 0 |
Asset-backed securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 1,593 | 0 | 1,350 | 0 |
F&G Acquisition |  | 854 |  | 854 |
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI | 20 | 9 | (3) | 9 |
Assets, Purchases | 813 | 91 | 1,171 | 91 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | (90) | (5) | (182) | (5) |
Assets, Net transfer In (Out) of Level 3 | (27) | 67 | (27) | 67 |
Balance at End of Period | 2,309 | 1,016 | 2,309 | 1,016 |
Change in Unrealized Gains (Losses) Incl in OCI | 18 | 9 | 14 | 9 |
Commercial mortgage-backed securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 25 | 0 | 26 | 0 |
F&G Acquisition |  | 26 |  | 26 |
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI | 0 | 0 | (1) | 0 |
Assets, Purchases | 0 | 0 | 0 | 0 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 25 | 26 | 25 | 26 |
Change in Unrealized Gains (Losses) Incl in OCI | 0 | 0 | 1 | 0 |
Corporates |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 1,247 | 14 | 1,289 | 17 |
F&G Acquisition |  | 1,238 |  | 1,238 |
Assets, Total Gains (Losses) Included in Earnings | 2 | 0 | 9 | (3) |
Assets, Total Gains (Losses) Included in AOCI | 16 | 26 | (26) | 26 |
Assets, Purchases | 18 | 0 | 57 | 0 |
Assets, Sales | (7) | 0 | (8) | 0 |
Assets, Settlements | (76) | (14) | (107) | (14) |
Assets, Net transfer In (Out) of Level 3 | 1 | 0 | (13) | 0 |
Balance at End of Period | 1,201 | 1,264 | 1,201 | 1,264 |
Change in Unrealized Gains (Losses) Incl in OCI | 18 | 26 | 37 | 26 |
Hybrids |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period |  | 0 | 4 | 0 |
F&G Acquisition |  | 4 |  | 4 |
Assets, Total Gains (Losses) Included in Earnings |  | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI |  | 0 | 0 | 0 |
Assets, Purchases |  | 0 | 0 | 0 |
Assets, Sales |  | 0 | 0 | 0 |
Assets, Settlements |  | 0 | (4) | 0 |
Assets, Net transfer In (Out) of Level 3 |  | 0 | 0 | 0 |
Balance at End of Period | 0 | 4 | 0 | 4 |
Change in Unrealized Gains (Losses) Incl in OCI |  | 0 | 0 | 0 |
Municipals |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 41 | 0 | 43 | 0 |
F&G Acquisition |  | 38 |  | 38 |
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI | 2 | 2 | 0 | 2 |
Assets, Purchases | 0 | 0 | 0 | 0 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 43 | 40 | 43 | 40 |
Change in Unrealized Gains (Losses) Incl in OCI | 3 | 3 | 7 | 3 |
Residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 487 | 0 | 483 | 0 |
F&G Acquisition |  | 534 |  | 534 |
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI | (10) | (15) | 2 | (15) |
Assets, Purchases | 5 | 1 | 10 | 1 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | (39) | (4) | (52) | (4) |
Assets, Net transfer In (Out) of Level 3 | 0 | (7) | 0 | (7) |
Balance at End of Period | 443 | 509 | 443 | 509 |
Change in Unrealized Gains (Losses) Incl in OCI | (6) | (13) | 21 | (13) |
Foreign Governments |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 17 | 0 | 17 | 0 |
F&G Acquisition |  | 16 |  | 16 |
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI | 0 | 0 | 0 | 0 |
Assets, Purchases | 0 | 0 | 0 | 0 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 17 | 16 | 17 | 16 |
Change in Unrealized Gains (Losses) Incl in OCI | 0 | 0 | 2 | 0 |
Short-Term |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 0 |  | 0 |  |
Assets, Total Gains (Losses) Included in Earnings | 0 |  | 0 |  |
Assets, Total Gains (Losses) Included in AOCI | 1 |  | 1 |  |
Assets, Purchases | 302 |  | 302 |  |
Assets, Sales | 0 |  | 0 |  |
Assets, Settlements | 0 |  | 0 |  |
Assets, Net transfer In (Out) of Level 3 | 0 |  | 0 |  |
Balance at End of Period | 303 |  | 303 |  |
Change in Unrealized Gains (Losses) Incl in OCI | 0 |  | 0 |  |
Equity securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 10 | 1 | 5 | 1 |
F&G Acquisition |  | 1 |  | 1 |
Assets, Total Gains (Losses) Included in Earnings | 0 | (1) | 2 | (1) |
Assets, Total Gains (Losses) Included in AOCI | 1 | 0 | 1 | 0 |
Assets, Purchases | 0 | 0 | 2 | 0 |
Assets, Sales | (1) | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 10 | 1 | 10 | 1 |
Change in Unrealized Gains (Losses) Incl in OCI | 0 | 0 | 0 | 0 |
Available-for-sale embedded derivative |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 28 | 0 | 27 | 0 |
F&G Acquisition |  | 20 |  | 20 |
Assets, Total Gains (Losses) Included in Earnings | 2 | 1 | 3 | 1 |
Assets, Total Gains (Losses) Included in AOCI | 0 | 0 | 0 | 0 |
Assets, Purchases | 0 | 0 | 0 | 0 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | 0 | 0 | 0 | 0 |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 30 | 21 | 30 | 21 |
Change in Unrealized Gains (Losses) Incl in OCI | 0 | 0 | 0 | 0 |
Other long-term investments |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period |  | 120 |  |  |
F&G Acquisition |  |  |  | 0 |
Assets, Total Gains (Losses) Included in Earnings |  |  |  | (61) |
Assets, Total Gains (Losses) Included in AOCI |  |  |  | 0 |
Assets, Purchases |  |  |  | 0 |
Assets, Net transfer In (Out) of Level 3 |  |  |  | (59) |
Balance at End of Period |  | 0 |  | 0 |
Change in Unrealized Gains (Losses) Incl in OCI |  |  |  | 0 |
Credit linked note |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 19 |  | 23 | 0 |
F&G Acquisition |  | 23 |  |  | $ 23
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 |  | 0
Assets, Total Gains (Losses) Included in AOCI | 0 | 0 | (4) |  | 0
Assets, Purchases | 0 | 0 | 0 |  | 0
Assets, Sales | 0 | 0 | 0 |  | 0
Assets, Settlements | 0 | 0 | 0 |  | $ 0
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | 0 |
Balance at End of Period | 19 | 23 | 19 | 23 |
Change in Unrealized Gains (Losses) Incl in OCI | $ 0 | $ 0 | $ 0 | $ 0 |

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