Variable Annuity and Insurance Guarantees (Liability Rollforward) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015
GMDB and GGU [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		$ 14	$ 9
Incurred claims		3	1
Paid claims		(6)	(1)
Balance, at the end of the period		11	9
GMIB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		8	7
Balance, at the end of the period		8	7
GMWB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period	[1]	1,057	693
Incurred claims	[1]	1,099	(225)
Balance, at the end of the period	[1]	2,156	468
GMAB [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period	[1]	0	(41)
Incurred claims	[1]	45	(4)
Paid claims	[1]	(1)
Balance, at the end of the period	[1]	44	(45)
UL [Member]
Changes in Additional Liabilities for Variable Annuity and Insurance Guarantees
Balance, at the beginning of the period		332	263
Incurred claims		44	45
Paid claims		(12)	(12)
Balance, at the end of the period		$ 364	$ 296

[1] The incurred claims for GMWB and GMAB represent the total change in the liabilities (contra liabilities).