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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Changes in Balance of Accumulated Other Comprehensive Loss, Net of Income Taxes
Changes in the balance of AOCL, net of income taxes, consisted of the following (in millions):
 
 
Postretirement  
Benefit Plans (a)  
 
Other, net

 
AOCL

Balance at December 31, 2016
 
$
(11,981
)
 
$
(121
)
 
$
(12,102
)
Other comprehensive (loss) income before reclassifications
 
(1,380
)
 
120

 
(1,260
)
Amounts reclassified from AOCL
 
 
 
 
 

Recognition of net actuarial losses
 
1,030

 
—

 
1,030

Amortization of net prior service credits
 
(228
)
 
—

 
(228
)
Other
 
—

 
21

 
21

Total reclassified from AOCL
 
802

 
21

 
823

Total other comprehensive (loss) income
 
(578
)
 
141

 
(437
)
Balance at December 31, 2017
 
(12,559
)
 
20

 
(12,539
)
Other comprehensive loss before reclassifications
 
(501
)
 
(105
)
 
(606
)
Amounts reclassified from AOCL
 
 
 
 
 

Recognition of net actuarial losses
 
1,455

 
—

 
1,455

Amortization of net prior service credits
 
(253
)
 
—

 
(253
)
Other
 
—

 
30

 
30

Total reclassified from AOCL
 
1,202

 
30

 
1,232

Total other comprehensive (loss) income
 
701

 
(75
)
 
626

Reclassification of income tax effects from tax reform(b)
 
(2,396
)

(12
)

(2,408
)
Balance at December 31, 2018
 
(14,254
)
 
(67
)
 
(14,321
)
Other comprehensive loss before reclassifications
 
(2,182
)
 
18

 
(2,164
)
Amounts reclassified from AOCL
 
 
 
 
 

Recognition of net actuarial losses
 
1,148

 
—

 
1,148

Amortization of net prior service credits
 
(240
)
 
—

 
(240
)
Other
 
—

 
23

 
23

Total reclassified from AOCL
 
908

 
23

 
931

Total other comprehensive income (loss)
 
(1,274
)
 
41

 
(1,233
)
Balance at December 31, 2019
 
$
(15,528
)
 
$
(26
)
 
$
(15,554
)
(a) 
AOCL related to postretirement benefit plans is shown net of tax benefits of $4.2 billion at December 31, 2019, $3.9 billion at December 31, 2018 and $6.5 billion at December 31, 2017. These tax benefits include amounts recognized on our income tax returns as current deductions and deferred income taxes, which will be recognized on our tax returns in future years. See “Note 9 – Income Taxes” and “Note 11 – Postretirement Benefit Plans” for more information on our income taxes and postretirement benefit plans.
(b) 
During 2018, we reclassified the impact of the income tax effects related to the Tax Cuts and Jobs Act of 2017 (the Tax Act) from AOCL to retained earnings by the same amount with zero impact to total equity.