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Summary of Significant Accounting Policies Cash Flows reconciliation (2016-18) (Tables)
 12 Months Ended
Dec. 31, 2017
Cash Flows reconciliation (2016-18) [Abstract]  
Cash Flows reconciliation (2016-18) [Table Text Block]
The following tables provide the impact of adoption on the Company’s Consolidated Statements of Cash Flows for the years ended December 31, 2016 and 2015.
 
Year Ended December 31, 2016

 
As Previously Reported
 
Effect of Change
 
As Adjusted
Decrease in program cash
$
31

 
$
(31
)
 
$
—

Other, net
3

 
(2
)
 
1

Net cash used in investing activities
(2,149
)
 
(33
)
 
(2,182
)
 
 
 
 
 
 
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash

(4
)
 
(2
)
 
(6
)
 
 
 
 
 
 
Net increase in cash and cash equivalents, program and restricted cash
38

 
(35
)
 
3

Cash and cash equivalents, program and restricted cash, beginning of period

452

 
265

 
717

Cash and cash equivalents, program and restricted cash, end of period

$
490

 
$
230

 
$
720

 
 
 
 
 
 
 
Year Ended December 31, 2015

 
As Previously Reported
 
Effect of Change
 
As Adjusted
Increase in program cash
$
(148
)
 
$
148

 
$
—

Other, net
6

 
(3
)
 
3

Net cash used in investing activities
(2,830
)
 
145

 
(2,685
)
 
 
 
 
 
 
Effect of changes in exchange rates on cash and cash equivalents, program and restricted cash

(41
)
 
(9
)
 
(50
)
 
 
 
 
 
 
Net decrease in cash and cash equivalents, program and restricted cash
(172
)
 
136

 
(36
)
Cash and cash equivalents, program and restricted cash, beginning of period

624

 
129

 
753

Cash and cash equivalents, program and restricted cash, end of period

$
452

 
$
265

 
$
717