Variable Annuity and Insurance Guarantees (VA Guarantees Details) (Details) - USD ($) $ in Millions		9 Months Ended	12 Months Ended
		Sep. 30, 2016	Dec. 31, 2015
GMDB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 74,955	$ 73,270
Contract value in separate accounts	[1]	69,854	68,406
Net amount at risk	[1]	$ 325	$ 743
Weighted average attained age	[1]	65 years	65 years
GMDB [Member] | Return of premium [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 56,748	$ 54,716
Contract value in separate accounts	[1]	54,787	52,871
Net amount at risk	[1]	$ 144	$ 297
Weighted average attained age	[1]	65 years	65 years
GMDB [Member] | Five/six-year reset [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 9,052	$ 9,307
Contract value in separate accounts	[1]	6,371	6,731
Net amount at risk	[1]	$ 23	$ 78
Weighted average attained age	[1]	66 years	65 years
GMDB [Member] | One-year ratchet [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 6,614	$ 6,747
Contract value in separate accounts	[1]	6,237	6,379
Net amount at risk	[1]	$ 80	$ 266
Weighted average attained age	[1]	67 years	67 years
GMDB [Member] | Five-year ratchet [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,587	$ 1,613
Contract value in separate accounts	[1]	1,527	1,556
Net amount at risk	[1]	$ 5	$ 20
Weighted average attained age	[1]	64 years	63 years
GMDB [Member] | Other [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 954	$ 887
Contract value in separate accounts	[1]	932	869
Net amount at risk	[1]	$ 73	$ 82
Weighted average attained age	[1]	71 years	71 years
GGU death benefit [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,063	$ 1,056
Contract value in separate accounts	[1]	1,011	1,004
Net amount at risk	[1]	$ 111	$ 113
Weighted average attained age	[1]	68 years	67 years
GMIB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 251	$ 270
Contract value in separate accounts	[1]	233	251
Net amount at risk	[1]	$ 12	$ 17
Weighted average attained age	[1]	68 years	68 years
GMWB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 42,457	$ 40,419
Contract value in separate accounts	[1]	42,304	40,288
Net amount at risk	[1]	$ 358	$ 332
Weighted average attained age	[1]	66 years	66 years
GMWB [Member] | GMWB standard benefit [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 2,805	$ 3,118
Contract value in separate accounts	[1]	2,796	3,109
Net amount at risk	[1]	$ 2	$ 2
Weighted average attained age	[1]	70 years	69 years
GMWB [Member] | GMWB for life [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 39,652	$ 37,301
Contract value in separate accounts	[1]	39,508	37,179
Net amount at risk	[1]	$ 356	$ 330
Weighted average attained age	[1]	66 years	66 years
GMAB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 3,689	$ 4,018
Contract value in separate accounts	[1]	3,681	4,006
Net amount at risk	[1]	$ 14	$ 31
Weighted average attained age	[1]	59 years	58 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.