Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

Commitments And Contingencies [Abstract]

Future Payments For Obligations Under Noncancelable Long Distance Contracts And Service Agreements

($ in millions)	Amount
Year ending December 31:
2021	$	85
2022		22
2023		19
2024		4
2025		2
Thereafter		4
Total	$	136

Outstanding Performance Letters Of Credit

($ in millions)	Amount
CNA Financial Corporation (CNA)	$	49
AIG Insurance		28
Zurich (1)		62
Total	$	139

⁽¹⁾ Zurich letters of credit exclude approximately $57 million of cash held in trust in lieu of issuing letters of credit.