Investments - Maturities of AFS Securities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Consolidated Entity Excluding Variable Interest Entities (VIE) and Related Party
Amortized Cost
Due in one year or less	$ 1,081
Due after one year through five years	8,855
Due after five years through ten years	11,209
Due after ten years	21,101
CLO, ABS, CMBS and RMBS	21,194
Amortized Cost	63,440	$ 60,025
Fair Value
Due in one year or less	1,082
Due after one year through five years	8,988
Due after five years through ten years	11,339
Due after ten years	21,688
CLO, ABS, CMBS and RMBS	21,558
Total AFS fixed maturity securities	64,655	59,265
Consolidated Entity Excluding Variable Interest Entities (VIE)
Amortized Cost
Amortized Cost	65,136
Fair Value
Total AFS fixed maturity securities	66,339
Consolidated Entity Excluding Variable Interest Entities (VIE) | Related Party
Amortized Cost
Due after five years through ten years	3
CLO, ABS, CMBS and RMBS	1,693
Amortized Cost	1,696	1,462
Fair Value
Due after five years through ten years	3
CLO, ABS, CMBS and RMBS	1,681
Total AFS fixed maturity securities	$ 1,684	$ 1,437