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Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2018
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
The changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2018 and 2017, were as follows:
($ in millions)
 
Benefit Plans
 
Other
 
Total
Balance as of March 31, 2017
 
$
(935
)
 
$
—

 
$
(935
)
Other comprehensive income (loss) before reclassifications
 
—

 
3

 
3

Amounts reclassified from accumulated other comprehensive income (loss)
 
 
 
 
 
 
Amortization of net actuarial loss (gain)1
 
23

 
—

 
23

Tax benefit (expense) for items of other comprehensive income
 
(9
)
 
(1
)
 
(10
)
Net current period other comprehensive income (loss)
 
14

 
2

 
16

Balance as of June 30, 2017
 
(921
)
 
2

 
(919
)
 
 
 
 
 
 
 
Balance as of March 31, 2018
 
(1,095
)
 
(3
)
 
(1,098
)
Other comprehensive income (loss) before reclassifications
 
—

 
(2
)
 
(2
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
 
 
 
 
 
Amortization of net actuarial loss (gain)1
 
21

 
—

 
21

Tax benefit (expense) for items of other comprehensive income
 
(6
)
 
—

 
(6
)
Net current period other comprehensive income (loss)
 
15

 
(2
)
 
13

Balance as of June 30, 2018
 
$
(1,080
)
 
$
(5
)
 
$
(1,085
)
($ in millions)
 
Benefit Plans
 
Other
 
Total
Balance as of December 31, 2016
 
$
(948
)
 
$
(3
)
 
$
(951
)
Other comprehensive income (loss) before reclassifications
 
—

 
7

 
7

Amounts reclassified from accumulated other comprehensive income (loss)
 
 
 
 
 
 
Amortization of prior service cost (credit)1
 
(1
)
 
—

 
(1
)
Amortization of net actuarial loss (gain)1
 
46

 
—

 
46

Tax benefit (expense) for items of other comprehensive income
 
(18
)
 
(2
)
 
(20
)
Net current period other comprehensive income (loss)
 
27

 
5

 
32

Balance as of June 30, 2017
 
(921
)
 
2

 
(919
)
 
 
 
 
 
 
 
Balance as of December 31, 2017
 
(906
)
 
6

 
(900
)
Other comprehensive income (loss) before reclassifications
 
—

 
(2
)
 
(2
)
Amounts reclassified from accumulated other comprehensive income (loss)
 
 
 
 
 
 
Amortization of prior service cost (credit)1
 
1

 
—

 
1

Amortization of net actuarial loss (gain)1
 
40

 
—

 
40

Tax benefit (expense) for items of other comprehensive income
 
(11
)
 
—

 
(11
)
Net current period other comprehensive income (loss)
 
30

 
(2
)
 
28

Effect of Accounting Standards Update 2016-012
 
—

 
(11
)
 
(11
)
Effect of Accounting Standards Update 2018-023
 
(204
)
 
2

 
(202
)
Balance as of June 30, 2018
 
$
(1,080
)
 
$
(5
)
 
$
(1,085
)
1 These accumulated comprehensive income (loss) components are included in the computation of net periodic benefit cost. See Note 16: Employee Pension and Other Postretirement Benefits. The tax benefit associated with amounts reclassified from accumulated other comprehensive income (loss) for the three months ended June 30, 2018 and 2017, was $6 million and $9 million, respectively. The tax benefit associated with amounts reclassified from accumulated other comprehensive income (loss) for the six months ended June 30, 2018 and 2017, was $11 million and $18 million, respectively.
2 The Company adopted ASU 2016-01 as of January 1, 2018. Accordingly, accumulated other comprehensive income of $11 million related to available-for-sale securities, net of $4 million tax expense, was reclassified to retained earnings.
3 The Company adopted ASU 2018-02 as of January 1, 2018. Accordingly, stranded tax effects of $202 million related to the Tax Act were reclassified to retained earnings.