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Debt
 3 Months Ended
Mar. 31, 2022
Debt [Abstract]  
Debt 9. Debt

Changes in debt (in millions) were as follows:

For the Three

Months Ended

March 31,

2022

Balance as of beginning-of-year

$

6,625

3.40% senior notes issued, due 2032

300

Repayment of 4.20% senior notes, due 2022

(300

)

Unamortized premiums (discounts)

(1

)

Unamortized debt issuance costs

(2

)

Unamortized adjustments from discontinued hedges

(3

)

Fair value hedge on interest rate swap agreements

(58

)

Balance as of end-of-period

$

6,561