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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2018
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | $ 4,400 | $ 2,920 | $ 3,267 | $ 138 |
F&G Acquisition |  |  |  | 2,754 |
Assets, Total Gains (Losses) Included in Earnings | (2) | 1 | 12 | (63) |
Assets, Total Gains (Losses) Included in AOCI | 11 | 46 | (19) | 68 |
Assets, Purchases | 1,417 | 128 | 2,959 | 220 |
Assets, Sales | (111) | (1) | (119) | (1) |
Assets, Settlements | (568) | (154) | (913) | (177) |
Assets, Net transfer In (Out) of Level 3 | (44) | (90) | (84) | (89) |
Balance at End of Period | 5,103 | 2,850 | 5,103 | 2,850 |
Change in Unrealized Gains (Losses) Incl in OCI | 11 | 48 | 93 | 73 |
Liabilities |  |  |  |  |
Balance at Beginning of Period | 3,759 | 2,957 | 3,409 | 0 |
F&G Acquisition |  |  |  | 2,857 |
Liabilities, Total Gains (Losses) Included in Earnings | (320) | 209 | 35 | 309 |
Liabilities, Total Gains (Losses) Included in AOCI | 0 | 0 | 0 | 0 |
Liabilities, Purchases | 0 | 0 | 0 | 0 |
Liabilities, Sales | 0 | 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 | 3,439 | 3,166 | 3,439 | 3,166 |
Change in Unrealized Gains (Losses) Incl in OCI | 0 | 0 | 0 | 0 |
Future policy benefits |  |  |  |  |
Liabilities |  |  |  |  |
Balance at Beginning of Period |  | 5 | 5 | 0 |
F&G Acquisition |  |  |  | 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 |  | 0 | (4) | 0 |
Liabilities, Settlements |  | 0 | (1) | 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 | 3,759 | 2,952 | 3,404 | 0 |
F&G Acquisition |  |  |  | 2,852 |
Liabilities, Total Gains (Losses) Included in Earnings | (320) | 209 | 35 | 309 |
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 | 3,439 | 3,161 | 3,439 | 3,161 |
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 | 2,309 | 1,016 | 1,350 | 0 |
F&G Acquisition |  |  |  | 854 |
Assets, Total Gains (Losses) Included in Earnings | (1) | (1) | (1) | (1) |
Assets, Total Gains (Losses) Included in AOCI | 14 | 11 | 11 | 20 |
Assets, Purchases | 1,188 | 118 | 2,359 | 209 |
Assets, Sales | (97) | (1) | (97) | (1) |
Assets, Settlements | (125) | (109) | (307) | (114) |
Assets, Net transfer In (Out) of Level 3 | (44) | (90) | (71) | (23) |
Balance at End of Period | 3,244 | 944 | 3,244 | 944 |
Change in Unrealized Gains (Losses) Incl in OCI | 11 | 12 | 25 | 21 |
Commercial mortgage-backed securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 25 | 26 | 26 | 0 |
F&G Acquisition |  |  |  | 26 |
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI | (1) | 0 | (2) | 0 |
Assets, Purchases | 12 | 0 | 12 | 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 | 36 | 26 | 36 | 26 |
Change in Unrealized Gains (Losses) Incl in OCI | 0 | 1 | 1 | 1 |
Corporates |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 1,201 | 1,264 | 1,289 | 17 |
F&G Acquisition |  |  |  | 1,238 |
Assets, Total Gains (Losses) Included in Earnings | (1) | (1) | 8 | (4) |
Assets, Total Gains (Losses) Included in AOCI | (3) | 21 | (29) | 47 |
Assets, Purchases | 19 | 3 | 76 | 3 |
Assets, Sales | (14) | 0 | (22) | 0 |
Assets, Settlements | (89) | (20) | (196) | (34) |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | (13) | 0 |
Balance at End of Period | 1,113 | 1,267 | 1,113 | 1,267 |
Change in Unrealized Gains (Losses) Incl in OCI | (2) | 19 | 35 | 45 |
Hybrids |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period |  | 4 | 4 | 0 |
F&G Acquisition |  |  |  | 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 | 43 | 40 | 43 | 0 |
F&G Acquisition |  |  |  | 38 |
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI | 0 | 2 | 0 | 4 |
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 | 42 | 43 | 42 |
Change in Unrealized Gains (Losses) Incl in OCI | 0 | 2 | 7 | 5 |
Residential mortgage-backed securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 443 | 509 | 483 | 0 |
F&G Acquisition |  |  |  | 534 |
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI | (3) | 12 | (1) | (3) |
Assets, Purchases | 4 | 5 | 14 | 6 |
Assets, Sales | 0 | 0 | 0 | 0 |
Assets, Settlements | (50) | (25) | (102) | (29) |
Assets, Net transfer In (Out) of Level 3 | 0 | 0 | 0 | (7) |
Balance at End of Period | 394 | 501 | 394 | 501 |
Change in Unrealized Gains (Losses) Incl in OCI | 1 | 14 | 22 | 1 |
Foreign Governments |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 17 | 16 | 17 | 0 |
F&G Acquisition |  |  |  | 16 |
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 | 0 |
Assets, Total Gains (Losses) Included in AOCI | 1 | 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 | 18 | 16 | 18 | 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 | 303 |  | 0 |  |
Assets, Total Gains (Losses) Included in Earnings | 0 |  | 0 |  |
Assets, Total Gains (Losses) Included in AOCI | 1 |  | 2 |  |
Assets, Purchases | 192 |  | 494 |  |
Assets, Sales | 0 |  | 0 |  |
Assets, Settlements | (304) |  | (304) |  |
Assets, Net transfer In (Out) of Level 3 | 0 |  | 0 |  |
Balance at End of Period | 192 |  | 192 |  |
Change in Unrealized Gains (Losses) Incl in OCI | 1 |  | 1 |  |
Equity securities |  |  |  |  |
Fixed maturity securities available-for-sale: |  |  |  |  |
Balance at Beginning of Period | 10 | 1 | 5 | 1 |
F&G Acquisition |  |  |  | 1 |
Assets, Total Gains (Losses) Included in Earnings | (1) | 1 | 1 | 0 |
Assets, Total Gains (Losses) Included in AOCI | 1 | 0 | 2 | 0 |
Assets, Purchases | 2 | 2 | 4 | 2 |
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 | 12 | 4 | 12 | 4 |
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 | 30 | 21 | 27 | 0 |
F&G Acquisition |  |  |  | 20 |
Assets, Total Gains (Losses) Included in Earnings | 1 | 2 | 4 | 3 |
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 | 31 | 23 | 31 | 23 |
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, Sales |  |  |  | 0 |
Assets, Settlements |  |  |  | 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 | 23 | 0 |
F&G Acquisition |  |  |  |  | $ 23
Assets, Total Gains (Losses) Included in Earnings | 0 | 0 | 0 |  | 0
Assets, Total Gains (Losses) Included in AOCI | 1 | 0 | (3) |  | 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 | 20 | 23 | 20 | 23 |
Change in Unrealized Gains (Losses) Incl in OCI | $ 0 | $ 0 | $ 0 | $ 0 |

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