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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Retirement Benefits [Abstract]  
Schedule of Changes in Projected Benefit Obligations [Table Text Block]
A December 31 measurement date is used for all of the defined benefit and postretirement plans. The status of these plans as of December 31, 2021 and 2020 is summarized below (dollars in millions):
 December 31,
 Pension BenefitsOther Benefits
 2021202020212020
Change in benefit obligation:
Benefit obligation at beginning of year$254 $220 $81 $87 
Service cost18 14 3 3 
Interest cost4 6 2 2 
Participant contributions— — — — 
Amendments— — (3)— 
Actuarial (gains) losses(8)25 (6)(9)
Benefits paid(12)(12)(2)(2)
Foreign exchange translations and other adjustments— 1 — — 
Benefit obligation at end of year$256 $254 $75 $81 
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
 December 31,
 Pension BenefitsOther Benefits
 2021202020212020
Change in plan assets:
Fair value of plan assets at beginning of year$157 $133 $— $— 
Actual return on plan assets15 18 — — 
Employer contributions19 18 2 2 
Participant contributions— — — — 
Benefits paid and expenses(12)(12)(2)(2)
Fair value of plan assets at end of year$179 $157 $— $— 
Funded status at end of year$(77)$(97)$(75)$(81)
Schedule of Net Funded Status [Table Text Block]
 December 31,
 Qualified Plans
Non-Qualified Plans(1)
Total
 202120202021202020212020
Aggregate fair value of plan assets$179 $157 $— $— $179 $157 
Aggregate projected benefit obligations166 160 90 94 256 254 
Over (under) funded$13 $(3)$(90)$(94)$(77)$(97)
(1)For non-qualified plans, there are no required funding levels.
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]
 December 31,
 Pension BenefitsOther Benefits
 2021202020212020
Amounts recognized in accumulated other comprehensive income:
Net actuarial loss$52 $71 $20 $29 
Net prior service cost (credit)— — (9)(8)
Total$52 $71 $11 $21 
Schedule Of Projected Benefit Obligations In Excess Of Fair Value Of Plan Assets [Table Text Block]
The following table presents information for qualified and non-qualified pension plans with a projected benefit obligation in excess of plan assets as of December 31, 2021 and 2020 (dollars in millions):
 20212020
Projected benefit obligation$256 $254 
Fair value of plan assets179 157 
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]
The following table presents information for pension plans with an accumulated benefit obligation in excess of plan assets as of December 31, 2021 and 2020 (dollars in millions):
20212020
Accumulated benefit obligation$248 $243 
Fair value of plan assets179 157 
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] The components of net periodic benefit cost, included in other operating expenses on the consolidated statements of income, and other changes in plan assets and benefit obligations recognized in other comprehensive income were as follows (dollars in millions):
  
Pension BenefitsOther Benefits
 202120202019202120202019
Net periodic benefit cost:
Service cost$18 $14 $13 $3 $3 $3 
Interest cost4 6 7 2 2 3 
Expected return on plan assets(10)(9)(7)— — — 
Amortization of net actuarial losses6 5 4 2 2 1 
Amortization of prior service cost (credit)— — — (1)(1)(1)
Settlements— — — — — — 
Net periodic benefit cost18 16 17 6 6 6 
Other changes in plan assets and benefit obligations recognized in other comprehensive income:
Net actuarial (gains) losses(13)17 14 (6)(8)14 
Amortization of net actuarial (losses)(6)(5)(4)(2)(2)(1)
Amortization of prior service (cost) credit— — — 1 1 1 
Settlements— — — — — — 
Prior service cost (credit)— — — (3)— — 
Foreign exchange translations and other adjustments— — — — — — 
Total recognized in other comprehensive income(19)12 10 (10)(9)14 
Total recognized in net periodic benefit cost and other comprehensive income$(1)$28 $27 $(4)$(3)$20 
Schedule of Expected Benefit Payments [Table Text Block]
The following benefit payments, which reflect expected future service as appropriate, are expected to be paid (dollars in millions):
Pension Benefits    Other Benefits    
2022$12 $2 
202315 2 
202416 2 
202518 2 
202617 3 
2027 – 2031
97 17 
Defined Benefit Plan, Assumptions [Table Text Block]
The weighted average assumptions used to determine the benefit obligation and net periodic benefit cost were as follows:
 Pension BenefitsOther Benefits
 202120202019202120202019
Benefit obligation
Discount rate2.64 %2.22 %3.05 %2.76 %2.41 %3.17 %
Rate of compensation increase4.74 %4.69 %4.61 %n/an/an/a
Net periodic benefit cost
Discount rate2.21 %3.03 %4.03 %2.41 %3.17 %4.17 %
Expected long-term rate of return on plan assets6.50 %7.00 %7.00 %n/an/an/a
Rate of compensation increase4.71 %4.60 %4.16 %n/an/an/a
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]
The assumed health care cost trend rates used in measuring the accumulated non-pension post-retirement benefit obligation were as follows:
 As of December 31,
 20212020
Health care cost trend rates assumed for next year6.50 %7.00 %
Ultimate cost trend rate4.50 %4.50 %
Year ultimate trend is reached20262026
Schedule of Allocation of Plan Assets [Table Text Block]
The fair values of the Company’s qualified pension plan assets as of December 31, 2021 and 2020 are summarized below (dollars in millions):
  
December 31, 2021
  Fair Value Measurement Using:
 TotalLevel 1Level 2Level 3
Mutual Funds(1)
$179 $179 $— $— 
Cash— — — — 
Total$179 $179 $— $— 
(1)Mutual funds were invested 27% in U.S. equity funds, 38% in U.S. fixed income funds, 18% in non-U.S. equity funds and 17% in other.
  
December 31, 2020
  Fair Value Measurement Using:
 TotalLevel 1Level 2Level 3
Mutual Funds(2)
$157 $157 $— $— 
Cash— — — — 
Total$157 $157 $— $— 
(2)Mutual funds were invested 27% in U.S. equity funds, 39% in U.S. fixed income funds, 18% in non-U.S. equity funds and 16% in other.