Reinsurance (Reinsurance amounts recorded on the Consolidated Statement of Comprehensive Income (Loss)) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Notes to Financial Statements [Abstract]
Direct insurance premiums and fee income	$ 9,064us-gaap_DirectPremiumsWritten	$ 8,023us-gaap_DirectPremiumsWritten	$ 7,379us-gaap_DirectPremiumsWritten
Reinsurance assumed	7us-gaap_AssumedPremiumsWritten	8us-gaap_AssumedPremiumsWritten	9us-gaap_AssumedPremiumsWritten
Reinsurance ceded	(1,410)us-gaap_CededPremiumsWritten	(1,275)us-gaap_CededPremiumsWritten	(1,190)us-gaap_CededPremiumsWritten
Total insurance premiums and fee income	7,661us-gaap_PremiumsWrittenNet	6,756us-gaap_PremiumsWrittenNet	6,198us-gaap_PremiumsWrittenNet
Direct insurance benefits	6,127	5,487	5,095
Reinsurance recoveries netted against benefits	(1,448)	(1,625)	(1,554)
Total benefits	$ 4,679	$ 3,862	$ 3,541

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Amount of written premiums assumed from other entities.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

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Amount of written premiums ceded to other entities.

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Amount, before premiums ceded to other entities and premiums assumed by the entity, of premiums written.

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Amount, before effect of policies assumed or ceded, of expense related to provision for policy benefits and costs incurred.

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Amount, after effects of policies assumed or ceded, of expense related to the provision for policy benefits and costs incurred.

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Amount of recovery (expense) related to provision for policy benefits and costs incurred for policies assumed and ceded.

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