Contingencies and Commitments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Total rental expense on operating leases	$ 44us-gaap_LeaseAndRentalExpense	$ 44us-gaap_LeaseAndRentalExpense	$ 43us-gaap_LeaseAndRentalExpense
Proceeds from sales leaseback transaction	83
Total accumulated amortization related to sales leaseback transaction	55
Loss contingency accrual, insurance-related assessment, premium tax offset	(15)	(6)
Football Stadium Naming Rights Commitment [Member]
Amount of commitment, total	140
Time period of commitment	20 year
Approximate Amount Of Commitment Per Year	7
Variable Annuity Product Concentration Risk [Member] \| Variable Annuity Deposits Total [Member]
Concentration risk, percentage	20.00%	17.00%	19.00%
Variable Annuity Product Concentration Risk [Member] \| Variable Annuity Account Values Total [Member]
Concentration risk, percentage	44.00%	47.00%	50.00%
Fund Choice Concentration Risk [Member] \| Variable Annuity Deposits Total [Member]
Concentration risk, percentage	22.00%	19.00%	21.00%
Fund Choice Concentration Risk [Member] \| Variable Annuity Account Values Total [Member]
Concentration risk, percentage	50.00%	54.00%	58.00%
Pending or Threatened Litigation [Member]
Loss Contingency, Range of Possible Loss, Maximum	$ 200

The approximate amount the entity expects to spend per year under the long-term purchase commitment.

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

+ Details

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- Definition

Specifies the time period covered by the arrangement.

+ References

No definition available.

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- Definition

The amount of insurance-related assessment liability that is expected to be recovered through a premium tax offset based on current laws applied to in-force policies.

+ References

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-Publisher FASB

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- Definition

The estimated maximum amount of possible loss from the contingency.

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- Definition

The accumulated depreciation and amortization related to the asset(s) sold in connection with the property sold to another party and leased back to the seller.

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- Definition

The gross proceeds received from the asset(s) sold in connection with the transaction involving the sale of property to another party and the lease back to the seller.

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