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Contingencies and Commitments (Tables)
 9 Months Ended
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule Of Contingent Contractual Obligations [Table Text Block]
The following table summarizes the Parent Company’s contingent contractual obligations as of September 30, 2017. Amounts presented in the following table represent the Parent Company’s current undiscounted exposure to guarantees and the range of maximum undiscounted potential exposure. The maximum exposure is not reduced by the amounts, if any, that could be recovered under the recourse or collateralization provisions in the guarantees.
Contingent Contractual Obligations
 
Amount
(in millions)
 
Number of Agreements
 
Maximum Exposure Range for Each Agreement (in millions)
Guarantees and commitments
 
$
806

 
21

 
<$1 — 272
Letters of credit under the unsecured credit facility
 
125

 
5

 
$2 — 73
Asset sale related indemnities (1)
 
27

 
1

 
$27
Letters of credit under the senior secured credit facility
 
9

 
17

 
<$1 — 2
Total
 
$
967

 
44

 
 

_____________________________
(1) 
Excludes normal and customary representations and warranties in agreements for the sale of assets (including ownership in associated legal entities) where the associated risk is considered to be nominal.