Variable Annuity and Insurance Guarantees (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
GMDB:
Variable Annuity Guarantees by Benefit Type
Total Contract Value	$ 69,072	$ 66,825
Contract Value in Separate Accounts	64,268	62,045
Net Amount at Risk	303	347
Weighted Average Attained Age	63 years	63 years
GMDB: | Return of premium
Variable Annuity Guarantees by Benefit Type
Total Contract Value	48,065	45,697
Contract Value in Separate Accounts	46,729	43,942
Net Amount at Risk	62	61
Weighted Average Attained Age	63 years	63 years
GMDB: | Five/six-year reset
Variable Annuity Guarantees by Benefit Type
Total Contract Value	11,018	11,233
Contract Value in Separate Accounts	8,498	8,722
Net Amount at Risk	77	115
Weighted Average Attained Age	63 years	63 years
GMDB: | One-year ratchet
Variable Annuity Guarantees by Benefit Type
Total Contract Value	7,346	7,367
Contract Value in Separate Accounts	6,927	6,933
Net Amount at Risk	103	106
Weighted Average Attained Age	65 years	65 years
GMDB: | Five-year ratchet
Variable Annuity Guarantees by Benefit Type
Total Contract Value	1,661	1,616
Contract Value in Separate Accounts	1,606	1,563
Net Amount at Risk	4	3
Weighted Average Attained Age	62 years	61 years
GMDB: | Other
Variable Annuity Guarantees by Benefit Type
Total Contract Value	982	912
Contract Value in Separate Accounts	958	885
Net Amount at Risk	57	62
Weighted Average Attained Age	68 years	68 years
GGU death benefit
Variable Annuity Guarantees by Benefit Type
Total Contract Value	980	958
Contract Value in Separate Accounts	928	907
Net Amount at Risk	102	93
Weighted Average Attained Age	64 years	63 years
GMIB
Variable Annuity Guarantees by Benefit Type
Total Contract Value	411	425
Contract Value in Separate Accounts	387	399
Net Amount at Risk	59	72
Weighted Average Attained Age	66 years	66 years
GMWB:
Variable Annuity Guarantees by Benefit Type
Total Contract Value	34,462	32,486
Contract Value in Separate Accounts	34,300	32,342
Net Amount at Risk	501	297
Weighted Average Attained Age	64 years	64 years
GMWB: | GMWB
Variable Annuity Guarantees by Benefit Type
Total Contract Value	3,828	3,898
Contract Value in Separate Accounts	3,812	3,880
Net Amount at Risk	48	34
Weighted Average Attained Age	67 years	66 years
GMWB: | GMWB for life
Variable Annuity Guarantees by Benefit Type
Total Contract Value	30,634	28,588
Contract Value in Separate Accounts	30,488	28,462
Net Amount at Risk	453	263
Weighted Average Attained Age	64 years	64 years
GMAB
Variable Annuity Guarantees by Benefit Type
Total Contract Value	3,888	3,773
Contract Value in Separate Accounts	3,874	3,762
Net Amount at Risk	$ 5	$ 5
Weighted Average Attained Age	57 years	57 years