v3.8.0.1

Value of Business Acquired (Balance of and Changes in VOBA) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Present Value of Future Insurance Profits [Roll Forward]
Balance, beginning of year	$ 2,314	$ 2,828	$ 2,836
Amortization—Impact of assumption and experience unlocking and true-ups	(56)	(246)	128
Amortization—All other	(311)	(351)	(385)
Change in unrealized investment gains and losses	(456)	(112)	214
Interest	75	81	86
Foreign currency translation	25	114	(57)
Other	0	0	6
Balance, end of year	1,591	$ 2,314	$ 2,828
CIGNA
Movement in Present Value of Future Insurance Profits [Roll Forward]
Balance, end of year	$ 223
Weighted Average Useful Life	12 years
Interest accrual rates	6.40%	6.40%	6.40%
Prudential Annuities Holding Company
Movement in Present Value of Future Insurance Profits [Roll Forward]
Balance, end of year	$ 38
Weighted Average Useful Life	5 years
Interest accrual rates	5.96%	6.00%	6.05%
Gibraltar Life
Movement in Present Value of Future Insurance Profits [Roll Forward]
Balance, end of year	$ 1,178
Weighted Average Useful Life	9 years
Gibraltar Life | Minimum
Movement in Present Value of Future Insurance Profits [Roll Forward]
Interest accrual rates	1.28%	1.28%	1.28%
Gibraltar Life | Maximum
Movement in Present Value of Future Insurance Profits [Roll Forward]
Interest accrual rates	2.87%	2.87%	2.87%
Aoba Life
Movement in Present Value of Future Insurance Profits [Roll Forward]
Balance, end of year	$ 0
Weighted Average Useful Life	7 years
Interest accrual rates	2.60%	2.60%	2.60%
Hartford Life Business
Movement in Present Value of Future Insurance Profits [Roll Forward]
Balance, end of year	$ 145
Weighted Average Useful Life	9 years
Hartford Life Business | Minimum
Movement in Present Value of Future Insurance Profits [Roll Forward]
Interest accrual rates	3.00%	3.00%	3.00%
Hartford Life Business | Maximum
Movement in Present Value of Future Insurance Profits [Roll Forward]
Interest accrual rates	6.17%	6.17%	6.17%
Gibraltar BSN Life Berhad
Movement in Present Value of Future Insurance Profits [Roll Forward]
Balance, end of year	$ 7
Weighted Average Useful Life	8 years
Gibraltar BSN Life Berhad | Minimum
Movement in Present Value of Future Insurance Profits [Roll Forward]
Interest accrual rates	4.07%	4.07%	4.07%
Gibraltar BSN Life Berhad | Maximum
Movement in Present Value of Future Insurance Profits [Roll Forward]
Interest accrual rates	5.51%	5.51%	5.51%

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Amount of adjustment to reflect the effect that would have been recognized had the unrealized holding gain (loss) actually been realized on the present value of future insurance profits being amortized using the gross profit method and the present value of future profits recognized as a result of a purchase of an insurance entity holding long-duration contracts.

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-Publisher FASB
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Rate of interest used in determination of present value of future profits on insurance contract acquired in business combination.

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Amount of amortization expense (reversal of expense) for present value of future profits of insurance contract acquired in business combination.

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