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Income Tax (Tables)
 9 Months Ended
Sep. 30, 2020
Income Tax Disclosure [Abstract]  
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
The provision for income tax expense differed from the amounts computed by applying the U.S. federal income tax statutory rate of 21.0% to pre-tax income as a result of the following for the three and nine months ended September 30, 2020 and 2019, respectively (dollars in millions):
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
2020
 
2019
 
2020
 
2019
Tax provision at U.S. statutory rate
 
$
60

 
$
73

 
$
81

 
$
173

Increase (decrease) in income taxes resulting from:
 
 
 
 
 
 
 
 
Tax rate differences on income in other jurisdictions
 
3

 
—

 
17

 
1

Differences in tax bases in foreign jurisdictions
 
(4
)
 
(10
)
 
(17
)
 
(31
)
Deferred tax valuation allowance
 
(2
)
 
28

 
—

 
51

Amounts related to uncertain tax positions
 
2

 
3

 
9

 
6

Corporate rate changes
 
13

 
—

 
13

 
(1
)
GILTI, net of credits
 
4

 
—

 
4

 
—

Equity based compensation
 
—

 
(1
)
 
—

 
(6
)
Return to provision adjustments
 
(3
)
 
(8
)
 
(4
)
 
(4
)
Accrued Expenses
 
(1
)
 
—

 
(1
)
 
—

Other, net
 
—

 
(1
)
 
(1
)
 
—

Total provision for income taxes
 
$
72

 
$
84

 
$
101

 
$
189

Effective tax rate
 
25.5
%
 
24.3
%
 
26.3
%
 
22.9
%