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Summary of Significant Accounting Policies Change in accounting principles (Tables)
 12 Months Ended
Dec. 31, 2019
Accounting Changes and Error Corrections [Abstract]  
Schedule of New Accounting Pronouncements and Changes in Accounting Principles [Table Text Block]
The cumulative effect of the changes made to our consolidated January 1, 2019 balance sheet for the adoption of ASU No. 2016-02 was as follows:
Classification
 
Balance at
December 31, 2018
 
Adjustments Due to
Topic 842
 
Balance at
January 1, 2019
 
 
(in millions) 
Assets
 
 
 
 
 
 
Property and equipment, net
 
$
1,546

 
$
(1
)
 
$
1,545

Lease right-of-use assets
 
—

 
548

 
548

Liabilities
 
 
 
 
 
 
Accrued expenses and other current liabilities
 
299

 
(1
)
 
298

Current maturities of long term debt
 
5

 
1

 
6

Operating lease current liabilities
 
—

 
25

 
25

Long term debt, net
 
2,280

 
6

 
2,286

Operating lease non-current liabilities
 
—

 
528

 
528

Other non-current liabilities
 
123

 
(12
)
 
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