| **Life Policy and Investment Contract Reserves (Tables)**      | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
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| **Liability for Future Policy Benefits [Abstract]**            |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |
| Reserve For Losses Loss Adjustment Expenses Table [Text Block] | This table summarizes our life policy and investment contract reserves:(Dollars in millions) September 30, 2016 December 31, 2015Life policy reserves:    Ordinary/traditional life $991 $943Other 45 44Subtotal 1,036 987Investment contract reserves:    Deferred annuities 864 860Universal life 565 558Structured settlements 170 174Other 6 4Subtotal 1,605 1,596Total life policy and investment contract reserves $2,641 $2,583      |

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| - References
No definition available.
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| - Definition
The entire disclosure for the present values of future benefits to be paid to or on behalf of policyholders and related expenses less the present value of future net premiums using assumptions such as estimates of expected investment yields, mortality, morbidity, terminations and expenses, applicable at the time the insurance contracts are made and unpaid claim costs relating to insurance contracts including estimates of costs relating to incurred but not reported claims based on the estimated ultimate cost of settling the claims (including effects of inflation and other societal and economic factors), using past experience adjusted for current trends and any other factors that would modify past experience by element such as business segment, country and interest rate range.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(13)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910
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