Move from equities to bonds aims to limit plans' risks.

Move from equities to bonds aims to limit plans' risks.

Company is closing the plan, which covers about 70,000 employees, to reduce costs.

Company is closing the plan, which covers about 70,000 employees, to reduce costs.

Shortfall swelled as the company spent more than $45B on share buybacks.

Shortfall swelled as the company spent more than $45B on share buybacks.

Higher PBGC premiums have pressured firms to close funding gap.

Higher PBGC premiums have pressured firms to close funding gap.