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Accumulated Other Comprehensive Income (Loss)
3 Months Ended
Mar. 31, 2022
Equity [Abstract]  
Accumulated Other Comprehensive Income (Loss)
10. Accumulated Other Comprehensive Income (Loss)

Changes, net of tax, in accumulated other comprehensive income (loss) were as follows:
(dollars in millions)Unrealized
Gains (Losses)
Available-for-Sale Securities (a)
Retirement
Plan Liabilities
Adjustments
Foreign
Currency
Translation
Adjustments
Other (b)Total
Accumulated
Other
Comprehensive
Income (Loss)
Three Months Ended March 31, 2022    
Balance at beginning of period$49 $1 $3 $8 $61 
Other comprehensive income (loss) before reclassifications
(81) 1 10 (70)
Reclassification adjustments from accumulated other comprehensive loss
(2)   (2)
Balance at end of period$(34)$1 $4 $18 $(11)
Three Months Ended March 31, 2021    
Balance at beginning of period$91 $$$— $94 
Other comprehensive income (loss) before reclassifications
(33)— 17 $(14)
Balance at end of period$58 $$$17 $80 
(a) There were no material amounts related to available-for-sale debt securities for which an allowance for credit losses was recorded during the three months ended March 31, 2022 and 2021.
(b) Other primarily includes changes in the fair value of our mark-to-market derivative instruments that have been designated as cash flow hedges.

Reclassification adjustments from accumulated other comprehensive income (loss) to the applicable line item on our consolidated statements of operations were immaterial for the three months ended March 31, 2022 and 2021.