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Accumulated Other Comprehensive Income (Loss)
9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)
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 LiabilitiesInvestments and OtherDeferred TaxesTotal
Balance at June 30, 2021$(1,068)$$(47)$(1,114)
Changes in value(19)(1)(16)
Amounts reclassified to earnings(a)— (1)
Balance at September 30, 2021$(1,080)$— $(44)$(1,124)
Balance at December 31, 2020$(1,102)$$(39)$(1,139)
Changes in value(2)(1)
Amounts reclassified to earnings17 (a)— (4)13 
Balance at September 30, 2021$(1,080)$— $(44)$(1,124)
Balance at June 30, 2020$(1,257)$$(5)$(1,259)
Changes in value(11)— (9)
Amounts reclassified to earnings333 (a)— (74)259 
Balance at September 30, 2020$(935)$$(77)$(1,009)
Balance at December 31, 2019$(560)$$(160)$(718)
Changes in value(781)173 (607)
Amounts reclassified to earnings406 (a)— (90)316 
Balance at September 30, 2020$(935)$$(77)$(1,009)
(a) This AOCI component is included in the computation of net periodic pension and other postretirement costs (see Note 5 of this report for additional information).