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Accumulated Other Comprehensive Income (Loss) (Tables)
 6 Months Ended
Jun. 30, 2020
Equity [Abstract]  
Components of Accumulated Other Comprehensive Income, Net of Tax
The tables below present the components of the Company's accumulated other comprehensive income (loss), net of tax ("AOCI") (in millions):
 

 
Pension and Other Postretirement Liabilities

Investments and Other

Deferred Taxes

Total
 
 
Balance at March 31, 2020
 
$
(613
)
 
$
(14
)
 
$
(144
)
 
$
(771
)
 
Changes in value
 
(721
)
 
17

 
156

 
(548
)
 
Amounts reclassified to earnings
 
77

(a)
—

 
(17
)
 
60

 
Balance at June 30, 2020
 
$
(1,257
)

$
3


$
(5
)

$
(1,259
)
 
Balance at December 31, 2019
 
$
(560
)

$
2


$
(160
)

$
(718
)
 
Changes in value
 
(770
)
 
1

 
171

 
(598
)
 
Amounts reclassified to earnings
 
73

(a)
—

 
(16
)
 
57

 
Balance at June 30, 2020
 
$
(1,257
)

$
3


$
(5
)

$
(1,259
)
 
 
 
 
 
 
 
 
 
 
 
Balance at March 31, 2019
 
$
(654
)
 
$
1

 
$
(140
)
 
$
(793
)
 
Changes in value
 
(29
)
 
2

 
7

 
(20
)
 
Amounts reclassified to earnings
 
8

(a)
—

 
(2
)
 
6

 
Balance at June 30, 2019
 
$
(675
)
 
$
3

 
$
(135
)
 
$
(807
)
 
Balance at December 31, 2018
 
$
(663
)
 
$
(4
)
 
$
(136
)
 
$
(803
)
 
Changes in value
 
(24
)
 
7

 
4

 
(13
)
 
Amounts reclassified to earnings
 
12

(a)
—

 
(3
)
 
9

 
Balance at June 30, 2019
 
$
(675
)
 
$
3

 
$
(135
)
 
$
(807
)

(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs (See Note 6 to the financial statements included in Part I, Item 1 for additional information).