Investments - Maturities of AFS Securities (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Consolidated Entity Excluding Variable Interest Entities (VIE) and Related Party
Amortized Cost
Due in one year or less	$ 1,041
Due after one year through five years	8,291
Due after five years through ten years	10,732
Due after ten years	16,582
CLO, ABS, CMBS and RMBS	20,725
Cost or Amortized Cost	57,371	$ 58,506
Fair Value
Due in one year or less	1,042
Due after one year through five years	8,337
Due after five years through ten years	10,721
Due after ten years	17,060
CLO, ABS, CMBS and RMBS	21,415
Total AFS fixed maturity securities	58,575	61,012
Consolidated Entity Excluding Variable Interest Entities (VIE)
Amortized Cost
Cost or Amortized Cost	57,872
Fair Value
Total AFS fixed maturity securities	59,080
Consolidated Entity Excluding Variable Interest Entities (VIE) | Related Party
Amortized Cost
CLO, ABS, CMBS and RMBS	501
Cost or Amortized Cost	501	399
Fair Value
CLO, ABS, CMBS and RMBS	505
Total AFS fixed maturity securities	$ 505	$ 406