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Equity
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
EQUITY
12.    EQUITY

Share Activity
Activity in the number of shares of common stock and treasury stock was as follows (in millions):
Common
Stock		Treasury
Stock
Balance as of December 31, 2018673 (256)
Transactions in connection with
stock-based compensation plans
— 1 
Open market stock purchases— (9)
Balance as of December 31, 2019673 (264)
Transactions in connection with
stock-based compensation plans
— 1 
Open market stock purchases— (2)
Balance as of December 31, 2020673 (265)
Transactions in connection with
stock-based compensation plans
— 1 
Balance as of December 31, 2021673 (264)
Preferred Stock
We have 20 million shares of preferred stock authorized with a par value of $0.01 per share. No shares of preferred stock were outstanding as of December 31, 2021 or 2020.
Treasury Stock
We purchase shares of our outstanding common stock as authorized under our common stock purchase program (described below) and to meet our obligations under employee stock-based compensation plans.

On January 23, 2018, our board of directors (Board) authorized our purchase of up to $2.5 billion of our outstanding common stock (the 2018 Program) with no expiration date. During the year ended December 31, 2021, we did not purchase any shares of our common stock under the 2018 Program. During the years ended December 31, 2020 and 2019, we purchased $83 million and $752 million, respectively, of our common stock under the 2018 program. As of December 31, 2021, we have approval under the 2018 Program to purchase approximately $1.4 billion of our common stock.

Common Stock Dividends
On January 20, 2022, our Board declared a quarterly cash dividend of $0.98 per common share payable on March 3, 2022 to holders of record at the close of business on February 3, 2022.
Income Tax Effects Related to Components of Other Comprehensive Income
The tax effects allocated to each component of other comprehensive income were as follows (in millions):
Before-Tax
Amount		Tax Expense
(Benefit)		Net Amount
Year ended December 31, 2021
Foreign currency translation adjustment$(47)$— $(47)
Pension and other postretirement benefits:
Gain arising during the year related to:
Net actuarial gain317 69 248 
Prior service cost(4)(1)(3)
Amounts reclassified into income related to:
Net actuarial loss80 18 62 
Prior service credit(25)(6)(19)
Curtailment and settlement loss8 2 6 
Effect of exchange rates2 — 2 
Net gain on pension and other
postretirement benefits
378 82 296 
Derivative instruments designated and
qualifying as cash flow hedges:
Net loss arising during the year(48)(5)(43)
Net loss reclassified into income46 5 41 
Net loss on cash flow hedges(2)— (2)
Other comprehensive income$329 $82 $247 
Before-Tax
Amount		Tax Expense
(Benefit)		Net Amount
Year ended December 31, 2020
Foreign currency translation adjustment$161 $— $161 
Pension and other postretirement benefits:
Loss arising during the year related to:
Net actuarial loss(128)(26)(102)
Prior service cost(5)(1)(4)
Amounts reclassified into income related to:
Net actuarial loss74 17 57 
Prior service credit(26)(6)(20)
Curtailment and settlement loss5 1 4 
Net loss on pension and other
postretirement benefits
(80)(15)(65)
Derivative instruments designated and
qualifying as cash flow hedges:
Net gain arising during the year36 3 33 
Net gain reclassified into income(34)(4)(30)
Net gain on cash flow hedges2 (1)3 
Other comprehensive income$83 $(16)$99 
Year ended December 31, 2019
Foreign currency translation adjustment$349 $— $349 
Pension and other postretirement benefits:
Loss arising during the year related to:
Net actuarial loss(245)(54)(191)
Prior service cost(3)(1)(2)
Miscellaneous loss— 4 (4)
Amounts reclassified into income related to:
Net actuarial loss38 9 29 
Prior service credit(28)(6)(22)
Curtailment and settlement loss4 1 3 
Net loss on pension and other
postretirement benefits
(234)(47)(187)
Derivative instruments designated and
qualifying as cash flow hedges:
Net loss arising during the year(6)(1)(5)
Net gain reclassified into income(2)— (2)
Net loss on cash flow hedges(8)(1)(7)
Other comprehensive income$107 $(48)$155 
Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive loss by component, net of tax, were as follows (in millions):
Foreign
Currency
Translation
Adjustment		Defined
Benefit
Plans
Items		Gains
(Losses) on
Cash Flow
Hedges		Total
Balance as of December 31, 2018$(1,022)$(485)$— $(1,507)
Other comprehensive income (loss)
before reclassifications
346 (197)(2)147 
Amounts reclassified from
accumulated other comprehensive 
loss
— 10 (1)9 
Other comprehensive income (loss)346 (187)(3)156 
Balance as of December 31, 2019(676)(672)(3)(1,351)
Other comprehensive income (loss)
before reclassifications
161 (106)14 69 
Amounts reclassified from
accumulated other comprehensive
loss
— 41 (13)28 
Other comprehensive income (loss)161 (65)1 97 
Balance as of December 31, 2020(515)(737)(2)(1,254)
Other comprehensive income (loss)
before reclassifications
(47)245 (21)177 
Amounts reclassified from
accumulated other comprehensive 
loss
— 49 18 67 
Effect of exchange rates— 2 — 2 
Other comprehensive income (loss)(47)296 (3)246 
Balance as of December 31, 2021$(562)$(441)$(5)$(1,008)
Gains (losses) reclassified out of accumulated other comprehensive loss and into net income (loss) were as follows (in millions):
Details about
Accumulated Other
Comprehensive Loss
Components		Affected Line
Item in the
Statement of
Income
Year Ended December 31,
202120202019
Amortization of items related to
defined benefit pension plans:
Net actuarial loss$(80)$(74)$(38)
(a) Other income, net
Prior service credit25 26 28 
(a) Other income, net
Curtailment and settlement(8)(5)(4)
(a) Other income, net
(63)(53)(14)Total before tax
14 12 4 Tax benefit
$(49)$(41)$(10)Net of tax
Gains (losses) on cash flow hedges:
Commodity contracts$(46)$34 $2 Revenues
(46)34 2 Total before tax
5 (4)— Tax (expense) benefit
$(41)$30 $2 Net of tax
Total reclassifications for the year$(90)$(11)$(8)Net of tax
________________________
(a)These accumulated other comprehensive loss components are included in the computation of net periodic benefit cost, as discussed in Note 14.