In a regulatory filing, the aviation giant indicated plans to raise the funds by selling stock and debt.
It also earlier announced that it was in an agreement to obtain US$10 billion in credit from multiple banks.
The moves come amid a machinist strike in the Seattle region which effectively shut down assembly plants for the 737 MAX and 777.
About 33,000 Boeing workers in the Pacific Northwest have been on strike for nearly a month in a fight focused on higher wages and improved retirement benefits.
Workers complain of more than a decade of near-flat wages during a period when inflation has risen.
Boeing staff with the International Association of Machinists and Aerospace Workers (IAM), walked off the job on Sept 13 after overwhelmingly rejecting a contract offer.
The direct financial impact of the first month of the strike cost Boeing more than US$3 billion, according to Anderson Economic Group.
Following the latest announcement, Boeing shares climbed 2.3% to end Tuesday.
The IAM said in a statement last week that it is “ready and willing to resume negotiations at any time.”
However, it added Monday: “While it is important to return to the table, the Union remains firm on securing an agreement that truly reflects the respect our members have earned and deserve.”
Last week, Boeing said it planned to cut 10% of its workforce as it projected a large third-quarter loss in the wake of the labour action.
The cuts of 17,000 positions globally will include executives, managers and employees, according to CEO Kelly Ortberg, who added that the company must “reset our workforce levels to align with our financial reality.”
Details of the cuts were expected to come this week.
The work stoppage has only added to the company’s litany of problems.
As a result of the strike, Boeing has said it is pushing back first delivery of the 777X to 2026 from 2025. The much-delayed jet was originally supposed to enter service in January 2020.
Boeing sank into further turmoil in January when a panel blew out mid-flight on an Alaska Airlines 737 MAX, necessitating an emergency landing, the aircraft involved in two fatal crashes in 2018 and 2019.
That led to the Federal Aviation Administration tightening oversight of Boeing’s production processes, capping the company’s output. Production on the MAX is now halted due to the IAM strike.