Contingencies and Commitments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total rental expense on operating leases	$ 42	$ 44	$ 44
Proceeds from sales leaseback transaction	47	83
Total accumulated amortization related to sales leaseback transaction	64	55
Loss contingency accrual, insurance-related assessment, premium tax offset	(16)	$ (15)
Football Stadium Naming Rights Commitment [Member]
Amount of commitment, total	$ 140
Time period of commitment	20 years
Approximate Amount Of Commitment Per Year	$ 7
Variable Annuity Product Concentration Risk [Member] \| Variable Annuity Deposits Total [Member]
Concentration risk, percentage	18.00%	20.00%	17.00%
Variable Annuity Product Concentration Risk [Member] \| Variable Annuity Account Values Total [Member]
Concentration risk, percentage	42.00%	44.00%	47.00%
Fund Choice Concentration Risk [Member] \| Variable Annuity Deposits Total [Member]
Concentration risk, percentage	20.00%	22.00%	19.00%
Fund Choice Concentration Risk [Member] \| Variable Annuity Account Values Total [Member]
Concentration risk, percentage	48.00%	50.00%	54.00%
Pending Litigation [Member]
Loss Contingency, Range of Possible Loss, Maximum	$ 175

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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- 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.

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- Definition

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

+ References

No definition available.

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Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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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- 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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Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in financing activities.

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