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Quarterly Results of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total revenues	$ 4,135	$ 5,361	$ 3,517	$ 4,425	$ 4,344	$ 4,638	$ 4,310	$ 3,965	$ 17,439	$ 17,258	$ 16,424
Total expenses	4,046	4,901	3,678	4,391	3,863	4,888	3,889	3,697	17,016	16,339	14,539
Net income (loss)	$ 143	$ 398	$ (94)	$ 52	$ 431	$ (161)	$ 363	$ 252	$ 499	$ 886	$ 1,641
Earnings (loss) per common share - basic:
Net income (loss) (in dollars per share)	$ 0.74	$ 2.06	$ (0.49)	$ 0.27	$ 2.18	$ (0.81)	$ 1.80	$ 1.23	$ 2.58	$ 4.41	$ 7.60
Earnings (loss) per common share - diluted:
Net income (loss) (in dollars per share)	$ 0.74	$ 2.01	$ (0.49)	$ 0.15	$ 2.15	$ (0.83)	$ 1.79	$ 1.22	$ 2.56	$ 4.38	$ 7.40
Parent Company [Member]
Total revenues									$ 971	$ 1,001	$ 1,183
Total expenses									345	410	340
Net income (loss)									$ 499	$ 886	$ 1,641

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