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Equity and Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Schedule of Components in Accumulated Other Comprehensive Income
The changes in the balances of Accumulated other comprehensive income by component are as follows:
(dollars in millions)
Foreign
currency
translation
adjustments

 
Unrealized gains (losses) on cash flow hedges

 
Unrealized gains (losses) on marketable securities

 
Defined benefit
pension and
postretirement
plans

 
Total

Balance at January 1, 2017
$
(713
)
 
$
(80
)
 
$
46

 
$
3,420

 
$
2,673

Other comprehensive income
245

 
818

 
10

 
327

 
1,400

Amounts reclassified to net income
—

 
(849
)
 
(24
)
 
(541
)
 
(1,414
)
Net other comprehensive income (loss)
245

 
(31
)
 
(14
)
 
(214
)
 
(14
)
Balance at December 31, 2017
(468
)
 
(111
)
 
32

 
3,206

 
2,659

Opening balance sheet adjustment (Note 1)
(15
)
 
(24
)
 
(13
)
 
682

 
630

Adjusted opening balance
(483
)
 
(135
)
 
19

 
3,888

 
3,289

Other comprehensive income (loss)
(117
)
 
(574
)
 
—

 
(164
)
 
(855
)
Amounts reclassified to net income
—

 
629

 
1

 
(694
)
 
(64
)
Net other comprehensive income (loss)
(117
)
 
55

 
1

 
(858
)
 
(919
)
Balance at December 31, 2018
(600
)
 
(80
)
 
20

 
3,030

 
2,370

Other comprehensive income (loss)
16

 
(699
)
 
8

 
—

 
(675
)
Amounts reclassified to net income
—

 
(37
)
 
(1
)
 
(659
)
 
(697
)
Net other comprehensive income (loss)
16

 
(736
)
 
7

 
(659
)
 
(1,372
)
Balance at December 31, 2019
$
(584
)
 
$
(816
)
 
$
27

 
$
2,371

 
$
998