Variable Annuity and Insurance Guarantees (VA Guarantees Details) (Details) - USD ($) $ in Millions		6 Months Ended	12 Months Ended
		Jun. 30, 2015	Dec. 31, 2014
GMDB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 76,067	$ 75,862
Contract value in separate accounts	[1]	71,239	71,050
Net amount at risk	[1]	$ 196	$ 131
Weighted average attained age	[1]	64 years	64 years
GMDB [Member] | Return of premium [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 56,176	$ 55,378
Contract value in separate accounts	[1]	54,345	53,565
Net amount at risk	[1]	$ 47	$ 24
Weighted average attained age	[1]	64 years	64 years
GMDB [Member] | Five/six-year reset [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 10,008	$ 10,360
Contract value in separate accounts	[1]	7,462	7,821
Net amount at risk	[1]	$ 31	$ 28
Weighted average attained age	[1]	65 years	64 years
GMDB [Member] | One-year ratchet [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 7,223	$ 7,392
Contract value in separate accounts	[1]	6,846	7,006
Net amount at risk	[1]	$ 69	$ 39
Weighted average attained age	[1]	67 years	66 years
GMDB [Member] | Five-year ratchet [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,734	$ 1,773
Contract value in separate accounts	[1]	1,677	1,717
Net amount at risk	[1]	$ 4	$ 2
Weighted average attained age	[1]	63 years	63 years
GMDB [Member] | Other [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 926	$ 959
Contract value in separate accounts	[1]	909	941
Net amount at risk	[1]	$ 45	$ 38
Weighted average attained age	[1]	70 years	70 years
GGU death benefit [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 1,097	$ 1,072
Contract value in separate accounts	[1]	1,045	1,019
Net amount at risk	[1]	$ 123	$ 123
Weighted average attained age	[1]	67 years	67 years
GMIB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 310	$ 343
Contract value in separate accounts	[1]	288	321
Net amount at risk	[1]	$ 10	$ 9
Weighted average attained age	[1]	67 years	67 years
GMWB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 41,231	$ 40,514
Contract value in separate accounts	[1]	41,096	40,394
Net amount at risk	[1]	$ 138	$ 96
Weighted average attained age	[1]	66 years	65 years
GMWB [Member] | GMWB standard benefit [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 3,478	$ 3,671
Contract value in separate accounts	[1]	3,467	3,659
Net amount at risk	[1]	$ 1	$ 1
Weighted average attained age	[1]	68 years	68 years
GMWB [Member] | GMWB for life [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 37,753	$ 36,843
Contract value in separate accounts	[1]	37,629	36,735
Net amount at risk	[1]	$ 137	$ 95
Weighted average attained age	[1]	66 years	65 years
GMAB [Member]
Variable Annuity Guarantees by Benefit Type
Total contract value	[1]	$ 4,246	$ 4,247
Contract value in separate accounts	[1]	4,229	4,234
Net amount at risk	[1]	$ 5	$ 2
Weighted average attained age	[1]	58 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.