Variable Annuity and Insurance Guarantees (VA Guarantees Details) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2017	Dec. 31, 2016
GMDB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 77,796	$ 73,954
Contract value in separate accounts	[1]	72,658	68,790
Net amount at risk	[1]	$ 95	$ 433
Weighted average attained age	[1]	66 years	65 years
GMDB [Member] | Return of premium [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 59,806	$ 56,143
Contract value in separate accounts	[1]	57,840	54,145
Net amount at risk	[1]	$ 11	$ 208
Weighted average attained age	[1]	66 years	65 years
GMDB [Member] | Five/six-year reset [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 8,869	$ 8,878
Contract value in separate accounts	[1]	6,141	6,170
Net amount at risk	[1]	$ 13	$ 22
Weighted average attained age	[1]	66 years	66 years
GMDB [Member] | One-year ratchet [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 6,502	$ 6,426
Contract value in separate accounts	[1]	6,139	6,050
Net amount at risk	[1]	$ 12	$ 110
Weighted average attained age	[1]	69 years	68 years
GMDB [Member] | Five-year ratchet [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,562	$ 1,542
Contract value in separate accounts	[1]	1,504	1,483
Net amount at risk	[1]	$ 1	$ 7
Weighted average attained age	[1]	65 years	64 years
GMDB [Member] | Other [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,057	$ 965
Contract value in separate accounts	[1]	1,034	942
Net amount at risk	[1]	$ 58	$ 86
Weighted average attained age	[1]	72 years	71 years
GGU death benefit [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,103	$ 1,047
Contract value in separate accounts	[1]	1,052	996
Net amount at risk	[1]	$ 126	$ 108
Weighted average attained age	[1]	69 years	68 years
GMIB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 236	$ 245
Contract value in separate accounts	[1]	219	227
Net amount at risk	[1]	$ 8	$ 13
Weighted average attained age	[1]	69 years	68 years
GMWB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 45,458	$ 42,086
Contract value in separate accounts	[1]	45,330	41,924
Net amount at risk	[1]	$ 162	$ 291
Weighted average attained age	[1]	67 years	66 years
GMWB [Member] | GMWB standard benefit [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 2,525	$ 2,650
Contract value in separate accounts	[1]	2,517	2,642
Net amount at risk	[1]	$ 2	$ 2
Weighted average attained age	[1]	71 years	70 years
GMWB [Member] | GMWB for life [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 42,933	$ 39,436
Contract value in separate accounts	[1]	42,813	39,282
Net amount at risk	[1]	$ 160	$ 289	[2]
Weighted average attained age	[1]	67 years	66 years
GMAB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 3,157	$ 3,484
Contract value in separate accounts	[1]	3,153	3,476
Net amount at risk	[1]	$ 0	$ 21
Weighted average attained age	[1]	59 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.

[2] Amount revised to reflect updated contractholder mortality assumptions at December 31, 2016.