Variable Annuity and Insurance Guarantees (VA Guarantees Details) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2019	Dec. 31, 2018
GMDB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 76,803	$ 71,380
Contract value in separate accounts	[1]	71,714	66,288
Net amount at risk	[1]	$ 134	$ 1,117
Weighted average attained age	[1]	67 years	67 years
GMDB [Member] | Return of premium [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 60,653	$ 55,810
Contract value in separate accounts	[1]	58,705	53,872
Net amount at risk	[1]	$ 17	$ 417
Weighted average attained age	[1]	67 years	67 years
GMDB [Member] | Five/six-year reset [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 7,835	$ 7,670
Contract value in separate accounts	[1]	5,108	4,941
Net amount at risk	[1]	$ 11	$ 112
Weighted average attained age	[1]	67 years	67 years
GMDB [Member] | One-year ratchet [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 5,806	$ 5,560
Contract value in separate accounts	[1]	5,466	5,210
Net amount at risk	[1]	$ 24	$ 417
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]	$ 1,365	$ 1,307
Contract value in separate accounts	[1]	1,310	1,251
Net amount at risk	[1]	$ 1	$ 23
Weighted average attained age	[1]	66 years	66 years
GMDB [Member] | Other [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,144	$ 1,033
Contract value in separate accounts	[1]	1,125	1,014
Net amount at risk	[1]	$ 81	$ 148
Weighted average attained age	[1]	73 years	72 years
GGU death benefit [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,071	$ 992
Contract value in separate accounts	[1]	1,018	940
Net amount at risk	[1]	$ 121	$ 112
Weighted average attained age	[1]	71 years	70 years
GMIB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 182	$ 180
Contract value in separate accounts	[1]	167	164
Net amount at risk	[1]	$ 8	$ 12
Weighted average attained age	[1]	70 years	69 years
GMWB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 46,986	$ 42,956
Contract value in separate accounts	[1]	46,871	42,860
Net amount at risk	[1]	$ 375	$ 745
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]	$ 1,989	$ 1,990
Contract value in separate accounts	[1]	1,983	1,984
Net amount at risk	[1]	$ 1	$ 3
Weighted average attained age	[1]	73 years	72 years
GMWB [Member] | GMWB for life [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 44,997	$ 40,966
Contract value in separate accounts	[1]	44,888	40,876
Net amount at risk	[1]	$ 374	$ 742
Weighted average attained age	[1]	68 years	68 years
GMAB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 2,494	$ 2,456
Contract value in separate accounts	[1]	2,490	2,450
Net amount at risk	[1]	$ 1	$ 24
Weighted average attained age	[1]	60 years	59 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.