Variable Annuity and Insurance Guarantees (VA Guarantees Details) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
		Mar. 31, 2020	Dec. 31, 2019
GMDB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 69,317	$ 79,415
Contract value in separate accounts	[1]	64,219	74,344
Net amount at risk	[1]	$ 1,565	$ 84
Weighted average attained age	[1]	68 years	67 years
GMDB [Member] | Return of premium [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 55,082	$ 62,909
Contract value in separate accounts	[1]	53,129	60,967
Net amount at risk	[1]	$ 611	$ 5
Weighted average attained age	[1]	68 years	67 years
GMDB [Member] | Five/six-year reset [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 6,920	$ 7,983
Contract value in separate accounts	[1]	4,189	5,263
Net amount at risk	[1]	$ 205	$ 7
Weighted average attained age	[1]	68 years	67 years
GMDB [Member] | One-year ratchet [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 5,080	$ 5,935
Contract value in separate accounts	[1]	4,740	5,600
Net amount at risk	[1]	$ 518	$ 7
Weighted average attained age	[1]	70 years	70 years
GMDB [Member] | Five-year ratchet [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,195	$ 1,396
Contract value in separate accounts	[1]	1,139	1,340
Net amount at risk	[1]	$ 46	$ 0
Weighted average attained age	[1]	67 years	66 years
GMDB [Member] | Other [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,040	$ 1,192
Contract value in separate accounts	[1]	1,022	1,174
Net amount at risk	[1]	$ 185	$ 65
Weighted average attained age	[1]	73 years	73 years
GGU death benefit [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 955	$ 1,115
Contract value in separate accounts	[1]	899	1,063
Net amount at risk	[1]	$ 107	$ 133
Weighted average attained age	[1]	71 years	71 years
GMIB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 150	$ 186
Contract value in separate accounts	[1]	136	172
Net amount at risk	[1]	$ 18	$ 6
Weighted average attained age	[1]	70 years	70 years
GMWB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 43,048	$ 48,798
Contract value in separate accounts	[1]	42,939	48,684
Net amount at risk	[1]	$ 1,236	$ 273
Weighted average attained age	[1]	68 years	68 years
GMWB [Member] | GMWB standard benefit [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,691	$ 1,999
Contract value in separate accounts	[1]	1,685	1,993
Net amount at risk	[1]	$ 6	$ 1
Weighted average attained age	[1]	73 years	73 years
GMWB [Member] | GMWB for life [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 41,357	$ 46,799
Contract value in separate accounts	[1]	41,254	46,691
Net amount at risk	[1]	$ 1,230	$ 272
Weighted average attained age	[1]	68 years	68 years
GMAB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 2,184	$ 2,528
Contract value in separate accounts	[1]	2,181	2,524
Net amount at risk	[1]	$ 35	$ 0
Weighted average attained age	[1]	60 years	60 years

[1] Individual variable annuity contracts may have more than one guarantee and therefore may be included in more than one benefit type. Variable annuity contracts for which the death benefit equals the account value are not shown in this table.