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RETIREMENT AND OTHER BENEFIT PROGRAMS (Tables)
 12 Months Ended
Dec. 31, 2019
Retirement Benefits [Abstract]  
Reconciliation of Pension and OPEB Plan Obligations, Assets and Funded Status The benefit plan information in the table below pertains to all of our pension and OPEB plans, both in the United States and in other countries. 
Pension benefitsOPEB
As Restated
as of and for the years ended December 31 (in millions)2019201820192018
Benefit obligations
Beginning of period$5,635  $6,182  $211  $235  
Service cost74  87  1  1  
Interest cost172  178  8  7  
Participant contributions4  5  —  —  
Actuarial (gain) loss924  (431) 26  (14) 
Benefit payments(267) (259) (18) (18) 
Settlements(2,550) (6) —  —  
Curtailment(13) (56) —  —  
Foreign exchange and other(6) (65) —  —  
End of period3,973  5,635  228  211  
Fair value of plan assets
Beginning of period4,774  5,261  —  —  
Actual return on plan assets939  (237) —  —  
Employer contributions69  51  18  18  
Participant contributions4  5  —  —  
Benefit payments(267) (259) (18) (18) 
Settlements(2,550) (6) —  —  
Foreign exchange and other4  (41) —  —  
End of period2,973  4,774  —  —  
Funded status at December 31$(1,000) $(861) $(228) $(211) 
Amounts recognized in the consolidated balance sheets
Noncurrent asset$77  $60  $—  $—  
Current liability(25) (25) (20) (20) 
Noncurrent liability(1,052) (896) (208) (191) 
Net liability recognized at December 31$(1,000) $(861) $(228) $(211) 
Information Relating to Individual Plans in Funded Status that have ABO in Excess of Plan Assets The following table is information relating to the individual plans in the funded status table above that have an ABO in excess of plan assets.
As Restated
as of December 31 (in millions)20192018
ABO$3,240  $4,981  
Fair value of plan assets$2,339  $4,246  
Information Relating to Individual Plans in Funded Status that have PBO in Excess of Plan Assets The following table presents information relating to the individual plans in the funded status table above that have a PBO in excess of plan assets (many of which also have an ABO in excess of assets and are therefore also included in the table directly above).
As Restated
as of December 31 (in millions)20192018
PBO$3,688  $5,386  
Fair value of plan assets$2,611  $4,465  
Expected Net Pension and OPEB Plan Payments for Next 10 Years
(in millions)Pension benefitsOPEB
2020$86  $20  
2021104  18  
2022118  17  
2023132  17  
2024149  16  
2024 through 2028917  71  
Total expected net benefit payments for next 10 years$1,506  $159  
Summary of Pre-Tax losses Included in AOCI
The following table is a summary of the pre-tax losses included in AOCI at December 31, 2019 and December 31, 2018.
(in millions)Pension benefitsOPEB
Actuarial loss (gain)$1,025  $(41) 
Prior service credit and transition obligation(9) (59) 
Total pre-tax loss recognized in AOCI at December 31, 2019$1,016  $(100) 
Actuarial loss (gain)$1,607  $(79) 
Prior service credit and transition obligation(10) (74) 
Total pre-tax loss (gain) recognized in AOCI at December 31, 2018 (As Restated)$1,597  $(153) 
Summary of Net-of-Tax Amounts Recorded in OCI Relating to Pension and OPEB Plans The following table is a summary of the net-of-tax amounts recorded in OCI relating to pension and OPEB plans.
As Restated
Year ended December 31 (in millions)201920182017
Gain (loss) arising during the year, net of tax expense (benefit) of $(64) in 2019, $(4) in 2018 and $25 in 2017
$(184) $(22) $32  
Amortization of loss to earnings, net of tax benefit of $6 in 2019, $14 in 2018 and $35 in 2017
25  55  102  
Settlement charge, net of tax benefit of $188 in 2019
$567  $—  $—  
Pension and other employee benefits gain$408  $33  $134  
Summary of Pre-tax Amounts Expected to be Amortized to Net Periodic Benefit Cost in 2019
With respect to the AOCI balance at December 31, 2019, the following table is a summary of the pre-tax amounts expected to be amortized to net periodic benefit cost in 2020.
(in millions)Pension benefitsOPEB
Actuarial loss/(gain)$78  $(4) 
Prior service credit and transition obligation(1) (14) 
Total pre-tax amount expected to be amortized from AOCI to net pension and OPEB cost in 2020$77  $(18) 
Net Periodic Benefit Cost - Continuing Operations
As Restated
Year ended December 31 (in millions)201920182017
Pension benefits
Service cost$74  $87  $91  
Interest cost172  178  180  
Expected return on plan assets(264) (303) (291) 
Amortization of net losses and other deferred amounts58  94  163  
Settlement charges755  1  2  
Other—  —  (2) 
Net periodic pension benefit cost$795  $57  $143  
OPEB
Service cost$1  $1  $1  
Interest cost8  7  7  
Amortization of net losses and prior service credit(27) (25) (26) 
Net periodic OPEB cost$(18) $(17) $(18) 
Weighted-Average Assumptions Used in Determining Benefit Obligations at Measurement Date
Pension benefitsOPEB
2019201820192018
Discount rate
U.S. and Puerto Rico plans3.44 %4.31 %3.16 %4.20 %
International plans1.34 %2.02 %n/a  n/a  
Rate of compensation increase
U.S. and Puerto Rico plans3.68 %3.66 %n/a  n/a  
International plans3.03 %3.08 %n/a  n/a  
Annual rate of increase in the per-capita costn/a  n/a  6.75 %7.00 %
Rate decreased ton/a  n/a  5.00 %5.00 %
by the year endedn/a  n/a  20272027
Pension benefitsOPEB
201920182017201920182017
Discount rate
U.S. and Puerto Rico plans4.18 %3.60 %4.09 %4.20 %3.51 %3.89 %
International plans2.02 %2.02 %2.03 %n/a  n/a  n/a  
Expected return on plan assets
U.S. and Puerto Rico plans6.29 %6.25 %6.50 %n/a  n/a  n/a  
International plans5.45 %5.58 %5.77 %n/a  n/a  n/a  
Rate of compensation increase
U.S. and Puerto Rico plans3.66 %3.42 %3.75 %n/a  n/a  n/a  
International plans3.08 %3.05 %3.11 %n/a  n/a  n/a  
Annual rate of increase in the per-capita costn/a  n/a  n/a  6.75 %7.00 %6.25 %
Rate decreased ton/a  n/a  n/a  5.00 %5.00 %5.00 %
by the year endedn/a  n/a  n/a  202720272023
Fair Value of Pension Plan Assets and Liabilities The following tables summarize our pension plan financial instruments that are measured at fair value on a recurring basis.
Basis of fair value measurement
(in millions)Balance at December 31, 2019Quoted prices
in active
markets for
identical assets
(Level 1)		Significant
other
observable
inputs
(Level 2)		Significant
unobservable
inputs
(Level 3)		Measured at NAV
Assets
Fixed income securities
Cash and cash equivalents$224  $72  $152  $—  $—  
U.S. government and government agency issues452  —  452  —  —  
Corporate bonds352  —  352  —  —  
Equity securities
Common stock:
Large cap231  231  —  —  —  
Mid cap158  158  —  —  —  
Small cap37  37  —  —  —  
Total common stock426  426  —  —  —  
Mutual funds442  189  253  —  —  
Common/collective trust funds668  19  272  —  377  
Partnership investments333  —  —  —  333  
Other holdings76  8  58  10  —  
Collateral held on loaned securities9  —  9  —  —  
Liabilities
Collateral to be paid on loaned securities(9) (9) —  —  —  
Fair value of pension plan assets$2,973  $705  $1,548  $10  $710  
As Restated
Basis of fair value measurement
(in millions)Balance at December 31, 2018Quoted prices
in active
markets for
identical assets
(Level 1)		Significant
other
observable
inputs
(Level 2)		Significant
unobservable
inputs
(Level 3)		Measured at NAV
Assets
Fixed income securities
Cash and cash equivalents$145  $21  $124  $—  $—  
U.S. government and government agency issues735  —  735  —  —  
Corporate bonds1,127  —  1,127  —  —  
Equity securities
Common stock:
Large cap541  541  —  —  —  
Mid cap298  298  —  —  —  
Small cap91  91  —  —  —  
Total common stock930  930  —  —  —  
Mutual funds356  135  221  —  —  
Common/collective trust funds919  —  210  —  709  
Partnership investments390  —  —  —  390  
Other holdings172  11  151  10  —  
Collateral held on loaned securities196  —  196  —  —  
Liabilities
Collateral to be paid on loaned securities(196) (34) (162) —  —  
Fair value of pension plan assets$4,774  $1,063  $2,602  $10  $1,099  
Changes in Fair Value Measurements that Used Significant Unobservable Inputs
The following table is a reconciliation of changes in fair value measurements that used significant unobservable inputs (Level 3).
(in millions)TotalCommon/collective
trust funds		Other
holdings
Balance at December 31, 2017$18  $8  $10  
Transfers out(8) (8) —  
Balance at December 31, 201810  —  10  
Purchases—  —  —  
Balance at December 31, 2019$10  $—  $10  
Funded Status Percentage of Pension Plans
The following table details the funded status percentage of our pension plans as of December 31, 2019, including certain plans that are unfunded in accordance with the guidelines of our funding policy outlined above.
United States and Puerto RicoInternational
as of December 31, 2019 (in millions)Qualified
plans		Nonqualified
plan		Funded
plans		Unfunded
plans		Total
Fair value of plan assets$2,060  n/a  $913  n/a  $2,973  
PBO2,278  $243  1,001  $451  3,973  
Funded status percentage90 %n/a  91 %n/a  75 %