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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The changes in accumulated other comprehensive income (loss) by component for the years ended December 31, 2017, 2016, and 2015, were as follows:
($ in millions)
 
Benefit Plans
 
Other
 
Total
Balance as of December 31, 2014
 
$
(864
)
 
$
2

 
$
(862
)
Other comprehensive income (loss) before reclassifications
 
(53
)
 
(5
)
 
(58
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
 
 
 
 
 
Amortization of prior service cost (credit)1
 
(1
)
 
—

 
(1
)
Amortization of net actuarial loss (gain)1
 
88

 
—

 
88

Tax benefit (expense) for items of other comprehensive income
 
(13
)
 
1

 
(12
)
Net current period other comprehensive income (loss)
 
21

 
(4
)
 
17

Balance as of December 31, 2015
 
(843
)
 
(2
)
 
(845
)
Other comprehensive income (loss) before reclassifications
 
(249
)
 
(1
)
 
(250
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
 
 
 
 
 
Amortization of prior service cost (credit)1
 
(1
)
 
—

 
(1
)
Amortization of net actuarial loss (gain)1
 
78

 
—

 
78

Tax benefit (expense) for items of other comprehensive income
 
67

 
—

 
67

Net current period other comprehensive income (loss)
 
(105
)
 
(1
)
 
(106
)
Balance as of December 31, 2016
 
(948
)
 
(3
)
 
(951
)
Other comprehensive income (loss) before reclassifications
 
(34
)
 
14

 
(20
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
 
 
 
 
 
Amortization of net actuarial loss (gain)1
 
93

 
—

 
93

Tax benefit (expense) for items of other comprehensive income
 
(17
)
 
(5
)
 
(22
)
Net current period other comprehensive income (loss)
 
42

 
9

 
51

Balance as of December 31, 2017
 
$
(906
)
 
$
6

 
$
(900
)
1 These accumulated comprehensive income (loss) components are included in the computation of net periodic benefit cost. See Note 18: Employee Pension and Other Postretirement Benefits. The tax expense associated with amounts reclassified from accumulated other comprehensive income (loss) for the years ended December 31, 2017, 2016, and 2015, was $36 million, $27 million, and $30 million, respectively.